What's the Difference Between A Dead and Live Virus?

iStock/Rost-9D
iStock/Rost-9D

Franklin Veaux:

There is none, because viruses aren't alive.

A virus straddles the fuzzy boundary between living and dead. That's why biologists and doctors talk about "inactivated" or "attenuated" viruses, not "dead" viruses.

It's helpful to think of a virus as a machine. In fact, in a lot of ways, it's a machine that's simpler than your car. What's the difference between a living and a dead car? None, because cars aren't alive.

Cars can be working or not working. You can, for example, pull the spark plug wires, or drain the gas tank, or fill the intake manifold with Silly Putty, and a working car will become a not-working car, even though they look pretty much the same.

Inactivated viruses are a bit like not-working cars: some part of the machinery has been changed or damaged to make it not work.

You can inactivate viruses by heating them so the protein coat is damaged, or the genetic material is destroyed. You can hit them with radiation to destroy the genetic material. You can break the virus into pieces.

Your body's immune system does not recognize the entire virus. It looks for and recognizes certain parts of the virus, called "antigens" or "antigen subunits." As long as just that part is intact, it doesn't matter how badly damaged the rest of the virus is.

By way of comparison, if you open the hood of a car, melt the engine into slag, and then close the hood, people walking down the street will still recognize it as a car. They'll see it and say "yep, that's a car," even though the engine is totally destroyed. You can take the wheels off and people will still say "yep, that thing I'm looking at is a car."

Your body will look at the outer shell of a virus and say "yep, that's a virus," even if the genetic material is completely destroyed (or entirely removed altogether). You can take parts of the virus off and your body will still say "yep, that thing I'm looking at is a virus."

This post originally appeared on Quora. Click here to view.

What Are the 12 Days of Christmas?

Antoninapotapenko/iStock via Getty Images
Antoninapotapenko/iStock via Getty Images

Everyone knows to expect a partridge in a pear tree from your true love on the first day of Christmas ... But when is the first day of Christmas?

You'd think that the 12 days of Christmas would lead up to the big day—that's how countdowns work, as any year-end list would illustrate—but in Western Christianity, "Christmas" actually begins on December 25 and ends on January 5. According to liturgy, the 12 days signify the time in between the birth of Christ and the night before Epiphany, which is the day the Magi visited bearing gifts. This is also called "Twelfth Night." (Epiphany is marked in most Western Christian traditions as happening on January 6, and in some countries, the 12 days begin on December 26.)

As for the ubiquitous song, it is said to be French in origin and was first printed in England in 1780. Rumors spread that it was a coded guide for Catholics who had to study their faith in secret in 16th-century England when Catholicism was against the law. According to the Christian Resource Institute, the legend is that "The 'true love' mentioned in the song is not an earthly suitor, but refers to God Himself. The 'me' who receives the presents refers to every baptized person who is part of the Christian Faith. Each of the 'days' represents some aspect of the Christian Faith that was important for children to learn."

In debunking that story, Snopes excerpted a 1998 email that lists what each object in the song supposedly symbolizes:

2 Turtle Doves = the Old and New Testaments
3 French Hens = Faith, Hope and Charity, the Theological Virtues
4 Calling Birds = the Four Gospels and/or the Four Evangelists
5 Golden Rings = the first Five Books of the Old Testament, the "Pentateuch", which gives the history of man's fall from grace.
6 Geese A-laying = the six days of creation
7 Swans A-swimming = the seven gifts of the Holy Spirit, the seven sacraments
8 Maids A-milking = the eight beatitudes
9 Ladies Dancing = the nine Fruits of the Holy Spirit
10 Lords A-leaping = the ten commandments
11 Pipers Piping = the eleven faithful apostles
12 Drummers Drumming = the twelve points of doctrine in the Apostle's Creed

There is pretty much no historical evidence pointing to the song's secret history, although the arguments for the legend are compelling. In all likelihood, the song's "code" was invented retroactively.

Hidden meaning or not, one thing is definitely certain: You have "The Twelve Days of Christmas" stuck in your head right now.

What Are the 12 Days of Christmas?

Tevarak/iStock via Getty Images
Tevarak/iStock via Getty Images

Everyone knows to expect a partridge in a pear tree from your true love on the first day of Christmas ... But when is the first day of Christmas?

You'd think that the 12 days of Christmas would lead up to the big day—that's how countdowns work, as any year-end list would illustrate—but in Western Christianity, "Christmas" actually begins on December 25th and ends on January 5th. According to liturgy, the 12 days signify the time in between the birth of Christ and the night before Epiphany, which is the day the Magi visited bearing gifts. This is also called "Twelfth Night." (Epiphany is marked in most Western Christian traditions as happening on January 6th, and in some countries, the 12 days begin on December 26th.)

As for the ubiquitous song, it is said to be French in origin and was first printed in England in 1780. Rumors spread that it was a coded guide for Catholics who had to study their faith in secret in 16th-century England when Catholicism was against the law. According to the Christian Resource Institute, the legend is that "The 'true love' mentioned in the song is not an earthly suitor, but refers to God Himself. The 'me' who receives the presents refers to every baptized person who is part of the Christian Faith. Each of the 'days' represents some aspect of the Christian Faith that was important for children to learn."

In debunking that story, Snopes excerpted a 1998 email that lists what each object in the song supposedly symbolizes:

2 Turtle Doves = the Old and New Testaments
3 French Hens = Faith, Hope and Charity, the Theological Virtues
4 Calling Birds = the Four Gospels and/or the Four Evangelists
5 Golden Rings = the first Five Books of the Old Testament, the "Pentateuch", which gives the history of man's fall from grace.
6 Geese A-laying = the six days of creation
7 Swans A-swimming = the seven gifts of the Holy Spirit, the seven sacraments
8 Maids A-milking = the eight beatitudes
9 Ladies Dancing = the nine Fruits of the Holy Spirit
10 Lords A-leaping = the ten commandments
11 Pipers Piping = the eleven faithful apostles
12 Drummers Drumming = the twelve points of doctrine in the Apostle's Creed

There is pretty much no historical evidence pointing to the song's secret history, although the arguments for the legend are compelling. In all likelihood, the song's "code" was invented retroactively.

Hidden meaning or not, one thing is definitely certain: You have "The Twelve Days of Christmas" stuck in your head right now.

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