If you like maths, what's the fastest way to calculate 1 ⁄ √x, to a reasonable approximation? Used in computer games to calculate reflections etc.

Answer: treat a floating point number as an integer, shift to the right (typically one CPU cycle) and subtract from a magic number (one more CPU cycle):

i = 0x5f3759d...

FREE online Tai Chi sessions for beginners in conjunction with The Mill. Starts Thursday 29th October, 10am. Register here: https://www.daolu.co.uk/milling-about/
Thursday 29th October at 10am
Thursday 12th November at 1pm
Thursday 26th November at 10am
Thursday 10th December at 1pm
Suitable for beginners, all welcome

When it’s put like that... 🤯

Autumn haircut for the wisteria. Note the ladder support at top, made it much more stable. Hard work, celebrated with a meal at our favourite cafe (https://lacafeteria.co.uk/).

"We’d like to introduce our newest CPR instructor, Smokey Bear." - Humble Fire Rescue >> See also: https://bit.ly/2GGkmhk

Today for your viewing pleasure, an Impossible drawing of a German Daschund. Supplied by www.impossiblebottle.com.au