In what must be the most touching and useful tribute to departed author Arthur C. Clarke ever attempted, a group of scientists authors are trying to dare time travel into existence. Sir Clarke famously stated that "when a [distinguished scientist] states that something is impossible, he is very probably wrong". And a lot of distinguished scientists just told LiveScience "Time travel is absolutely impossible".

The authors, including Charles Liu (author of "One Universe: At Home In The Cosmos"), Brian Greene (of "The Elegant Universe") and Michio Kaku ("Hyperspace") float a raft of objections to trans-temporal travel. True to Clarke's statement, sometimes affectionately known as "Clarke's Law", each objection seems more like reason to expect time travel than rule it out. Professor Greene states that all time-travel theories operate at the very boundaries of known physics, and are therefore unlikely to work. As opposed to, say, the boundaries of our understanding being where new discoveries are made. As Sir Clarke said years ago: "The only way of discovering the limits of the possible is to venture a little way past them into the impossible".
The other chief objection is the incomprehensible amounts of energy required to punch a hole in spacetime, or stabilise a wormhole, or engineer a double-cosmic-string-ring (yes, that's a real astrophysical concept) capable of bending space hard enough to let us pop back to the past. One point eighty-one jigawatts just isn't going to cut it here, whatever "jigawatts" turn out to be, and most calculations show that powering a time machine with a lightning strike would be like powering a sixteen-wheeler with a bag of jelly babies. (So it seems Marty won't be getting back to the future after all). Of course, the idea of lighting up New York would have had you committed to a mental home in the early eighteenth century. Pre-electricity, schemes were being suggested to transport the increasing numbers of people to the scant available heat and light in times of need.
Understand: the amount of energy we now take for granted was so vast, so utterly unimaginable to people in the past that they were preparing to restructure their whole society rather than even attempt to generate it. Of course, this doesn't guarantee that we'll be able to pop back and tell them. The false argument of past scientific ignorance, the "didn't scientists used to think the world was flat" gambit fails because we know so much more now. The key to progress is our cumulative knowledge, developed and refined by generations of researchers into a vast, accurate body of knowledge. We are far more likely to be able to find what's possible than at any point in history. What we know so far is probably right, and allows us to make predictions about what might be possible.
But until we can explain absolutely everything, we should still steer clear of saying something is impossible.

Valentine's Day History

There are varying opinions as to the origin of Valentine's Day. Some experts state that it originated from St. Valentine, a Roman who was martyred for refusing to give up Christianity. He died on February 14, 269 A.D., the same day that had been devoted to love lotteries. Legend also says that St. Valentine left a farewell note for the jailer's daughter, who had become his friend, and signed it "From Your Valentine". Other aspects of the story say that Saint Valentine served as a priest at the temple during the reign of Emperor Claudius. Claudius then had Valentine jailed for defying him. In 496 A.D. Pope Gelasius set aside February 14 to honour St. Valentine.

Gradually, February 14 became the date for exchanging love messages and St. Valentine became the patron saint of lovers. The date was marked by sending poems and simple gifts such as flowers. There was often a social gathering or a ball.

The History of Saint Valentine's Day

AValentine's Day started in the time of the Roman Empire. In ancient Rome, February 14th was a holiday to honour Juno. Juno was the Queen of the Roman Gods and Goddesses. The Romans also knew her as the Goddess of women and marriage.
The good Saint Valentine was a priest at Rome in the days of Claudius II. He and Saint Marius aided the Christian martyrs and secretly married couples, and for this kind deed Saint Valentine was apprehended and dragged before the Prefect of Rome, who condemned him to be beaten to death with clubs and to have his head cut off. He suffered martyrdom on the 14th day of February, about the year 270. At that time it was the custom in Rome, a very ancient custom, indeed, to celebrate in the month of February the Lupercalia, feasts in honour of a heathen god. On these occasions, amidst a variety of pagan ceremonies, the names of young women were placed in a box, from which they were drawn by the men as chance directed.


St. Valentine's Story

GLet me introduce myself. My name is Valentine. I lived in Rome during the third century. That was long, long ago! At that time, Rome was ruled by an emperor named Claudius. I didn't like Emperor Claudius, and I wasn't the only one! A lot of people shared my feelings.
Claudius wanted to have a big army. He expected men to volunteer to join. Many men just did not want to fight in wars. They did not want to leave their wives and families. As you might have guessed, not many men signed up. This made Claudius furious. So what happened? He had a crazy idea. He thought that if men were not married, they would not mind joining the army. So Claudius decided not to allow any more marriages. Young people thought his new law was cruel. I thought it was preposterous! I certainly wasn't going to support that law!

Did I mention that I was a priest? One of my favourite activities was to marry couples. Even after Emperor Claudius passed his law, I kept on performing marriage ceremonies -- secretly, of course. It was really quite exciting. Imagine a small candlelit room with only the bride and groom and myself. We would whisper the words of the ceremony, listening all the while for the steps of soldiers.

One night, we did hear footsteps. It was scary! Thank goodness the couple I was marrying escaped in time. I was caught. (Not quite as light on my feet as I used to be, I guess.) I was thrown in jail and told that my punishment was death.

I tried to stay cheerful. And do you know what? Wonderful things happened. Many young people came to the jail to visit me. They threw flowers and notes up to my window. They wanted me to know that they, too, believed in love.

One of these young people was the daughter of the prison guard. Her father allowed her to visit me in the cell. Sometimes we would sit and talk for hours. She helped me to keep my spirits up. She agreed that I did the right thing by ignoring the Emperor and going ahead with the secret marriages. On the day I was to die, I left my friend a little note thanking her for her friendship and loyalty. I signed it, "Love from your Valentine."

I believe that note started the custom of exchanging love messages on Valentine's Day. It was written on the day I died, February 14, 269 A.D. Now, every year on this day, people remember. But most importantly, they think about love and friendship. And when they think of Emperor Claudius, they remember how he tried to stand in the way of love, and they laugh -- because they know that love can't be beaten!

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