Apparently there is redundancy in memory: You store the same memory in different parts of your brain for accessing at different speeds. That speed would depend on the frequency of use and the importance of the knowledge.

America has had many other discoverers besides Columbus, but he seems to have made more satisfactory arrangements with the historians than any of the others.

Everyone, red state, blue state, everyone supports space exploration.

I abandoned my religious teachings after I read the Bible twice - cover to cover. It took me a couple of years.

The more you find out about the world, the more opportunities there are to laugh at it.

The most serious problem facing humankind is climate change.

Not wasting any water bottles is good. Not leaving the lights on is good. Turning the thermostat down in the winter, up in the summer, is good. But the best thing any of us in the developed world, especially in the United States, can be doing is talking about it.