For people worried about the Great Recession and the uncertainty of what is coming next, the characters of 'Mad Men' are good company.

A little-appreciated downside of the technology revolution is that, mainly without thinking about it, we have given up 'locational privacy.'

Mississippi's loose campaign finance laws allow lawyers and companies to contribute heavily to the judges they appear before. That is terrible for justice, since the courts are teeming with perfectly legal conflicts of interest.

Republicans and blacks had an unlikely alliance around 'max black' after the 1990 census. By concentrating black voters in some districts, the strategy elected a record number of black congressmen in 1992. But the remaining 'bleached' districts were more likely to elect white Republicans.

As children, we have vivid imaginations. We stay up late waiting for Santa Claus, dream of becoming president, and have ideas that defy physics. Then something happens. As we grow older, we start editing our imagination.

Very few societies on Earth developed science as we know it today. On the other hand, the number is not zero - the Greeks, the Chinese, and the Maya did, among others. Once invented, science proved so useful that it spread like mold on a petri dish.

Exploring and colonizing Mars can bring us new scientific understanding of climate change, of how planet-wide processes can make a warm and wet world into a barren landscape. By exploring and understanding Mars, we may gain key insights into the past and future of our own world.

My life in science has been rich and rewarding. I have sacrificed very little.