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



Australian Speakers Agency


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

The Skeptics Handbook

Think it has been debunked? See here.

The Skeptics Handbook II

Climate Money Paper



Wow. The colorblind see color

It’s not often that a technology provides so much instant enjoyment, astonishment, shaking, even tears. Tim Blair found a movie of a colorblind man seeing color for the first time. And there are lots of videos out there.

See one artist reduced to tears. Watch this young boy react. (The next man seems very happy but says “your world is so much better than mine.”) Or this boy at 40 seconds.

Know someone colorblind? Great Christmas Present (costs $350 USD plus).

People with red-green color blindness have red and green receptors that both react to an overlapping band of wavelengths producing shades of “brown”. I gather these glasses filter out the overlapping light so that the red receptors only react to red light and the green only to green.

(OK, so the first guy does “go on a bit” so watch then skip forward…)

Technology Review explains Enchroma Glasses:


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: