Mechanics:
What is acceleration? How is acceleration measured? How did the people who invented acceleration measured it?
Weight and mass and why one can float weightless in space?
Thermodynamics:
What does the statement 'hot air is lighter than cold air' really mean?
Biology:
What is fern?
What is mushroom? How do we know mushrooms do not make their own food? How do we know plants make their own food?
What is life? What is alive?
Are there animals with odd number of limbs?
What is the difference between nuts, fruits and vegetables?
History:
Breading and why some animals produce infertile offsspring?
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