A science presenter, writer, speaker & former TV host; author of The Skeptic's Handbook (over 200,000 copies distributed & available in 15 languages).


The Skeptics Handbook

Think it has been debunked? See here.

The Skeptics Handbook II

Climate Money Paper




The nerds have the numbers on precious metals investments on the ASX



Half a million people in the air at any one time

Marvel at the science and engineering that keeps these planes flying, and remarkably safely:

Planes in the sky with half a million people in the air at any one time | Guardian & Flightstats

How many flights are in the air at once? NOAA estimates that 5,000 planes are in the sky over the United States. On any given day, more than 87,000 flights travel through US airspace… globally estimates seem to be that there are around 8,000 – 13,000 though I didn’t happen to find an authoritative source.

This youtube shows the dots in motion: