Age-grading your race performances can be inspiring, instructional, or simply interesting. This is how you can effectively use an age grade calculator for your race times.

Physics and Python stuff. Most of the videos here are either adapted from class lectures or solving physics problems. I really like to use numerical calculations without all the fancy programming ...

Dame Judi Dench has gone abseiling – at the age of 84. The actress also comes face to face with a deadly python as well as crocodiles in new documentary, her partner has revealed.