The largest cell in the world is an ostrich’s egg. Before fertilization, the entire interior of the egg consists of a single cell, which is approximately 15 cm long and 13 cm wide and weighs up to 2.3 kgs (5 pounds).

Barometer is an instrument to measure atmospheric pressure, used especially in forecasting the weather and determining altitude.

A crescograph is a device for measuring the growth in plants. It was invented in the early 20th century by Sir Jagadish Chandra Bose.