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How heavy is a grown male orangutan? They're stocky, about as heavy as a big man, so maybe 100 kilograms. An orange is maybe 200 grams.

Orangutan

~100 kg

In grams

≈ 100,000 g

One orange

÷ 200 g

100,000 ÷ 200

≈ 500

Adult male Bornean orangutan (San Diego Zoo Wildlife Alliance)

≈ 87 kg (192 lb)

Whole orange with peel, 1 fruit (USDA FoodData Central)

÷ 159 g

87,000 ÷ 159

≈ 550

The Colosseum is an oval about two football pitches long and a bit narrower, so call it 170 meters across on average. The way around is about 3 times that, roughly 500 meters. How much line does one person cover with arms out? About a meter and a half.

Average width across

≈ 170 m

Around the oval, × 3

≈ 500 m

500 ÷ 1.5 m

≈ 330 people

Colosseum outer perimeter (189 × 156 m oval)

≈ 545 m

Line per person, hand to hand

≈ 1.5 m

545 ÷ 1.5

≈ 360 people

A hair is about a tenth of a millimeter wide, and foil is maybe a fifth of that. How wide is one atom? Way under a nanometer, call it a third of one.

Hair width

~0.1 mm

Foil, a fifth of that

≈ 0.02 mm = 20,000 nm

Atoms per nanometer

× 3

20,000 × 3

≈ 60,000

Standard household foil thickness (Reynolds)

0.016 mm = 16,000 nm

Center-to-center spacing of aluminum atoms (lattice 0.405 nm ÷ √2)

≈ 0.286 nm

16,000 ÷ 0.286

≈ 55,900

≈

56,000