How to make an explosive clock. How to use a watch as a compass.
See this note from SKRIBE:
"Your solution to 'How To Use A Watch As A Compass' only works in the Northern
Hemisphere. In the Southern Hemisphere you need to point the twelve (the one if on
daylight saving/summer time) at the sun, then NORTH is half-way between the hour hand and the twelve.
Neither solution works on or near the equator. The further away from the equator the more accurate the results."