As a general rule, there is a precept that we refrain from engaging in work or activities that hinder the worship owed to God, The joy proper to the Lord's day, the performance of the works of mercy, and the appropriate relaxation of mind and body. (Catechism #2185). 
 
That said, we also do well to avoid an excessive legalism against which Jesus himself taught when he said The Sabbath was made for man, not man for the Sabbath. (Mk 2:27) 
 
Hence, while one might ordinarily seek to avoid folding laundry etc. on a Sunday, such activity is not intrinsically wrong. Perhaps one finds such an activity relaxing in the company of other family members. Perhaps too, since the activity could not reasonably be accomplished on Saturday, it is an act of charity that helps the family to be prepared for the week ahead. 
 
Thus, we do well to seek a proper balance between maintaining the principles of joyful rest on Sunday, and avoiding excessive legalism.

Of its nature, the viewing of pornography is a mortal sin. As with any mortal sin, one’s culpability (blame worthiness) is affected by how freely one consents to the act, and the degree to which one fully knows and understands the gravity of the evil involved. 
 
Internet pornography presents a very serious temptation to many, and many pastoral challenges for the Church. The fact is, today, increasing numbers of people compulsively view this sinful material, and many are outright addicted to Internet pornography. 
 
As any confessor or pastor of souls will be able to attest, large numbers are approaching the confessional and counseling and are quite “stuck” in Internet pornography. Many have seen their relationships and marriages greatly harmed, and some even end up with criminal charges related to the viewing of pornographic images of minors. Addiction to pornography is a slippery slope that leads to increasingly debased and degrading imagery. Pornography is indeed, a snare, which lures its victims with promises of momentary delights, only to leave them quickly hungry for more. This is due to the increasingly insatiable lust that it ignites. 
 
One of the more effective remedies that has emerged recently is a system of accountability, wherein one's Internet activities are monitored and recorded, and a daily report is sent to someone of the pornography addict’s choice. This “sponsor,” of sorts, reviews the list and holds the addict accountable. Certainly too, filters can be of some help, to prevent tempting materials from appearing in the first place. These filters can be of great help to those who struggle more mildly with the problem. Sadly though, many true pornography addicts know their way around such filters. 
 
Finally, this salutary reminder: absolutely nothing we do on the Internet is private. When we are on the Internet, we are out in public, and our browsing habits are not hard to discover, for those who might wish to know. What’s done in the dark can be brought to the light. 
 
Take Internet pornography seriously, it is a grave sin, which causes great harm, and is highly addictive to many people. The Scriptures say, Flee fornication (1Cor 6:18). And one does well to heed this prescription in a particular way related to Internet pornography. Flee pornography; it is a snare.

No, both words are the same. Hallelujah is a Hebrew word, ( הַלְּלוּיָהּ Hallal (Praise) + Yah (The LORD). Hence “Hallelujah” means, “Praise the Lord!” But the exact way that the Hebrew letters are transliterated into English and other languages has varied a bit over time. Perhaps most influential is the fact that the Greek New Testament rendered the Hebrew word Hallelujah as ἀλληλούϊα (allelouia). And since Greek is generally more influential in English spellings than Hebrew, many English translations render the word as Alleluia. 
 
However, not an insubstantial number of English translators have preferred over the centuries, especially when translating the Old Testament Hebrew, to render the term Hallelujah. Some translators will use Hallelujah for the Old Testament and Alleluia for the New Testament. 
 
Music has also influenced the decision over which spelling to use since some of the famous compositions from the Baroque period, such as Messiah, used the spelling Hallelujah that was more common in earlier English translations of the Bible. 
 
At the end of the day, it is the same word, just with different spellings.

The Catechism says that sex must be ordered per se to the procreation of human life (# 2366). “Per se” does not mean every act can be fertile but only that “by itself” (i.e. per se) the act is not intentionally hindered from its natural ends. This is what contraception, homosexual acts, and certain heterosexual practices, that do not complete or naturally render the marital act, do. But it is clear to any biology novice that not every sexual act results in conception. 
 
Consider by analogy, that I call a friend, and this might result in speaking with her, or perhaps being sent to a voice mail. Whatever the final result, my reason and purpose for calling was to try to reach my friend. One would likely consider me a madman if, in dialing the numbers, I had no intent of reaching my friend, and was angry if she did pick up the phone and begin to speak. Whatever the final result, the calling of my friend is per se related to speaking with her. 
 
And this is what it means that marriage, and sexual activity, must be “per se” related to the procreation of children, even if the results of that activity do not always attain the full purpose of that action. 
 
Older and/or sterile people do not intentionally exclude one of the two fundamental reasons for marriage and sexual activity.

The practice you describe is allowed. In 1997 the American bishops received permission from the Congregation for Divine Worship for the celebration of funeral rites in the presence of cremated remains. 
 
There are some adaptions to the rites, however. The priest may greet the remains at the door and sprinkle them with holy water, but the covering of the remains with the cloth (the Pall) is omitted. The Easter candle may be placed near the cremated remains, but there was no mention of the priest incensing the remains. Otherwise, the funeral mass is celebrated as laid down in the Roman Missal and the funeral ritual. 
 
Prayers, which do not make reference to honoring the burying of the body of the deceased, should be chosen, instead of those, which have these references (cf Funeral Ritual #428). The prayers of final commendation at the end of the funeral mass are largely followed in the normal way. It is uncertain at this point whether the remains are to be incensed or not. It would seem this is permitted, but not required. The deacon or priest concludes the funeral Mass with an alternate dismissal listed in the rite, which makes no reference to the body. 
 
The forbiddance of cremation by the church in the past was due to the fact that many made use of it as a denial of the resurrection of the body. This is seldom the case today, but such an attitude must be ruled out before cremation is permitted. But note, "Although cremation is permitted by the church, it does not enjoy the same value as Burial of the body. The Church clearly prefers and urges that the body of the deceased be present for the funeral rites, since the presence of the human body better expresses the values which the Church affirms in those rites. (# 413)

Part of the answer depends on an important distinction, which many lose, in the Church’s teaching about stem cell research. The Church does not oppose all, or even most stem cell research. There are, for example, no moral issues with using stem cells harvested from adult humans, or from the umbilical cord after birth. It is only the use of stem cells acquired from human embryos, which the Church opposes, because it requires the killing of human life in order to obtain them. 
 
Hence, the company in question is not committing sin per se in supplying material for stem cell research. Only those who wrongfully use stem cells acquired from human embryos commit wrongdoing. 
 
However, let us suppose that it is clear to you that the company is certainly supplying some materials for the specific purpose of embryonic stem cell research. The morality of you accepting employment with this sort of a company would vary based on a number of factors. 
 
Let us presume, as is usually the case, that the pharmaceutical company is large and supplies a vast variety of pharmaceuticals for a wide array of medical purposes. In such a scenario taking employment with such a company would only involve you in remote material cooperation. And such associations, while not ideal, are morally permissible. 
 
However, if the position in the company that you are taking would require you to promote embryonic stem cell research to advance the sales of specific products related to embryonic stem cell research, such work would be of a more direct material cooperation. In such a case, you ought not take the job which would involve you directly advancing and cooperating in a moral evil. 

Well, I am not so sure. It's kind of like asking if Orville and Wilbur Wright would recognize the simple wooden and cloth plane they flew, compared to the modern jetliner of today. To some extent they certainly would see the basic structure, but they would also marvel at all the magnificent developments that their simple idea has ushered in. 
 
It would not be reasonable to assume that they would wag their finger and insist we go back to planes made of cloth and wood and gasoline motors. It seems more reasonable that they would admire the developments that have ensued, all of which built on the basic ideas that they set forth. 
 
I think it would be similar with the Apostles. It is clear that doctrine has developed over the years, as has liturgy and other necessary structures in the Church. But these things developed from the structures that were already there from the beginning. The seed of truth has become the mature tree. The hierarchal structure, established by Christ himself, has expanded to meet the needs of a now worldwide Church. 
 
You are free to consider things you don't like as pompous, but others see such things as dignified and appropriate. God, and the things of God, are rightly to be honored with some degree of ceremony and respect. 

It sounds as though you were describing the third-class relic. A first-class relic is some part of the body of a Saint, usually a fragment of a bone or perhaps a lock of hair. A second-class relic is some article owned by a canonized Saint, usually an article of clothing, or some other personal object associated with the Saint. A third-class relic is something, usually a cloth of some sort, which is merely touched to a first- or second- class relic. 
 
One may serenely dispose of third-class relics. Most piously and properly, this is done by burning or burying it. Merely pitching such things in the trash is probably to be avoided, though there is no absolute Church norm related to the disposal of third-class relics. 
 
The practice of mailing, or placing these third-class relics in the hands of the faithful may, at times seem annoying. But here too there are no absolute Church norms forbidding such a practice, or of mailing third-class relics. This is quite different from first-class relics, wherein significant church norms and laws are involved.

Your insight "once a priest, always a priest" is a correct one. Thus, a man who, "leaves the priesthood," is not leaving the priesthood, per se, but is setting aside the practice and discipline of the priestly ministry. 
 
For a priest to validly and licitly marry in the Church, he must first be “laicized.” That is, while his priestly character remains, he is permitted and then required to live as a layman in the Church. And so, except in very rare “danger of death” situations, he cannot hear confessions, or give anointing of the sick, and in nowise celebrate the Sacred Liturgy or exercise other offices related to the priestly ministry. 
 
Further, when laicized, he is usually dismissed from the discipline of celibacy and free to marry. Note that celibacy is a discipline. And while a common and expected discipline of most priests, it is not utterly intrinsic to the priesthood. There are married priests, most of them in the Eastern Rites of the Catholic Church. But even in the Western (Roman) Rite there are some married priests. Most of these have come over from Anglican or Lutheran ministry and were then ordained Catholic priests. 
 
Thus, when a man leaves the active priesthood, and is laicized, he can also have the discipline of celibacy relaxed for him by the Church, such that he can marry. 
 
It is certainly lamentable that some men do leave the priesthood, a ministry they agreed to accept for life. And yet the Church, as the loving mother, does make some pastoral provision for men who regrettably have need of leaving the active priestly ministry for grave reasons. These provisions are in place so as not to utterly lose them to the practice of the faith, and to hold them as close to Christ and the Church as possible.

Your answer is not far from the point. People often give the Church exaggerated power, as though she can do anything she pleases. But, as the last three Popes have all stated, the Church has no authority whatsoever to confer priestly ordination on women. This is because Jesus, though he broke many conventions of his day, nevertheless called only men to be apostles. And in the call of the apostles is the origin of the priesthood. 
 
The Church can no more alter the matter and form of this sacrament than she can use beer and pretzels, for consecration instead of bread and wine. There are just some limits we must observe.