Our friends at io9 have a great little overview of what we scientific types like to call the Eternal Sunshine Molecules (note: no scientific types call them that.). These are the recently-discovered molecules that may be able to erase, restore, retain, and protect our memories--at least, they might, in the coming decades.
Less than three weeks from now marks the 10th anniversary of the Sept. 11 terrorist attacks, one of the most traumatic events in modern memory and the motivation behind the persistent wars in the Middle East. If you could take a pill that would make you forget that day, would you do it?
Unless you are this woman, you probably have a long mental list of moments and facts you wish you could remember -- but for the life of you, you can't. To use a personal example, I periodically Google the words "yellow house Berlin," hoping to produce the name of that one hostel I lived in for a summer in college; alas, no success yet.