About johanrhodin

Johan Rhodin I'm a software engineer at Wolfram Research. I'm interested in Internet technology and services, languages (esp. German and Russian), math and sports you should also follow me on twitter

Computer games and source code

A lot of interesting things in computer games today:

1. Turns out that the source code for a legendary game was lost for the last ten years or so have now been found by the creators dad: http://jordanmechner.com/blog/2012/03/prince-of-persia-source-code-found.

Now if only the source for Commander Keen could be released..

2. Speaking of computer history, it seems like we don’t even know when Super Mario Bros was released.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Measuring the Earth

This is a story I find quite fascinating: the ancient Greeks knew that the Earth was round and could measure the size of it!

Eratosthenes (yeah, the guy with the sieve for finding prime numbers) lived in Alexandria. He knew that in Aswan, that lays on the tropic of cancer, the sun would be in zenit on the summer solstice. At the same time in Alexandria the sun casted a shadow with an angle of 7°10′. This together with the distance between Alexandria and Aswan (known at the time, the question is how accurate this measure was) gave the circumference of the Earth. Eratosthenes got the circumference right, give and take ~10%

Picture by http://commons.wikimedia.org/wiki/User:Erzbischof

More info here