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Compare salt and ice with an unsalted portion using two thermometers. Watch how melting can cool the salty mixture below 0 °C instead of warming it.

Moon phases are not caused by Earth's shadow. Use a ball and an LED lamp to see why the same sunlit half can look like a crescent or a full Moon.

A one-leg stand need not be hands-free: use a sturdy wall and practise for 5–10 seconds per side, only while you feel steady and in control.

Use dim red light to check a map while stargazing without disrupting your night vision as much. Keep brightness low: the colour alone is not enough.

Check tire pressure in cold weather before driving and use your car's recommended setting, not the maximum pressure printed on the tire sidewall.

Reduce wood stove pollution: skip fires lit just for atmosphere, check local air quality and use dry, untreated wood according to your stove manual.