The tutorial for the lunar lander is here (download pdf)
This involves creating a yspeed variable and then writing scripts for a motor (which is controlled by the inbuilt Etoys joystick - great feature, which will appeal to kids), for gravity and for the landing process (which works by colour under detection)
The final scripts look something like this (click on image for a closer look):
It's great fun manipulating the joystick to control the speed of descent.
Expertise and naval power
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Robert Farley has replied to my recent post on the obsolescence of naval
power. Unlike our previous exchange, a pile-on where I was (as he points
out) in a...
1 hour ago
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