Who Invented the Passenger Elevator?

Who Invented the Passenger Elevator?

The man who solved the elevator safety problem, making skyscrapers possible, was Elisha Otis, who is generally known as the inventor of the modern elevator. In 1852, Otis came up with a design that had a safety “brake.”

Who discovered the vaccine for polio?

Jonas Salk. Jonas Edward Salk (October 28, 1914 – June 23, 1995) was an American medical researcher and virologist. He discovered and developed the first successful inactivated polio vaccine. He was born in New York City to Jewish parents.

How many cups is 200 grams of flour?

The most common dry ingredients are flour (1 cup = 150g), sugar (1 cup = 200g), brown sugar (1 cup packed = 200g), rice (1 cup = 200g), raisins (1 cup = 140g). For butter 1 tablespoon is 15g, 1 stick is 110g and 1 cup is 225g. Confectioner’s sugar is icing sugar (1 cup = 100g).

Which bird produces milk?

The pigeon is one of only three bird species (the others being flamingos and male emperor penguins) known to produce ‘milk’ to feed their young. In pigeons the milk starts to be produced in the crop of the parent birds two days before eggs hatch.

Can you go blind from looking at a solar eclipse?

While it may be tempting to brush off warnings against looking up at this eclipse bare-eyed, don’t: The light of an eclipse really can damage your eyes — though warnings of total blindness are likely overstated. The condition is called solar retinopathy, and it occurs when bright light from the sun floods the retina

Why is it called venison?

Venison is the meat of a game animal, especially a deer. Etymology. The word derives from the Latin vēnor (to hunt or pursue). This term entered English through Norman in the 11th century, following the Norman invasion of England, and the establishment of Royal Forests.

Is Iceland part of the North American continent?

Iceland is closer to continental Europe than to mainland North America; thus, the island is generally included in Europe for historical, political, cultural, and practical reasons. Geologically the island includes parts of both continental plates.

What determines a person’s blood type?

A person’s ABO type is determined by the presence or absence of the A or B substance on his red cells. A person can have one or the other (types A or B respectively), both (type AB), or neither (type O). A blood protein which was discovered in 1940.