Ballpark — October 7, 2026

Answers to that day's 5 daily estimation questions.

Active volcanoes on Earth

1,350 volcanoes

About 50 erupt each year.

Weight of the Great Pyramid of Giza

6.0 million tons

Consists of roughly 2.3 million stone blocks.

Years between the wheel and the wheelie suitcase

5,000 years

The rolling suitcase was only patented in 1970.

Bridges in the city of Hamburg

2,500 bridges

Hamburg has more bridges than any other city in the world.

Elephants in the wild today

415,000 elephants

Populations are still under threat from poaching.