Radiation Dose Chart

XKCD have created a chart that compares the radiation a person would be exposed to in different situations.

It demonstrates how silly people can be when worrying about some things. I think they should
do another one indicating the amount of mercury found in vaccinations.

Using a cell phone (0 µSv)-a cell phone's transmitter does not
produce ionizing radiation* and does not cause cancer.

* Unless it's a bananaphone.

[via: XKCD]

Tic-Tac-Toe cheat sheet

xkcd have created a tic-tac-toe cheat sheet.

Your move is given by the position of the largest red symbol on the grid. When your opponent picks a move, zoom in on the region of the grid where they went. repeat.

There is an X and an O version, depending if you move first or second.

I have not tried it, but it seems very simple. I wonder if anyone will create a web or mobile app for this.

[via: xkcd]