Telling time to sunset by number-of-fingers technique.

Phone numbers for poison control, public utilites, animal control,

Standard table of tangents to calculate heights or distances.

Ways to stay warm (hot bricks, furniture fort, lexan hot water bottle for sleeping bag, etc...)

Proper orientation of debris shelter to wind.

Useful cordage plants.

Where water/food can be found in workplace.

Proper tire inflation pressure.

How to fix a flat tire (repair as well as replace).

Best local radio stations for news/traffic/weather/emergency info.

Where to find water (dry stream beds, seashore, homes).

Important knots (bowline, truckers hitch, lashing).

Burn times of common cannon fuses.

Calculating wattage loads of electronic devices so you don't overload your generator.

Distance and common weather patterns between you and sites likely to be nuked.

Cricket chirps to temperature conversion.

How to jumpstart a car.

Ground to air signalling.

Proper wood choices for spindle and hearth for fire bows.

Location of nearest natural salt lick.

Dosages of medicine for babies.

-Blast