Comment Dr. Iain Stewart (Score 1) 799
He is the host of "Earth: The Biography" and I find his enthusiasm infectious. He is one of my favorites.
On a side note, I read some of the criticism towards Michio Kaku, and deserved or not, is that not good science in its own right? To make people question things and then to set off to prove or disprove their theory? Even if his opinions can be controversial they serve a purpose.
How many people would call the original Star Trek good science? But then, look at how many scientist were inspired anyhow.