How long is a good cat nap?

How long is a good cat nap?

During sleep, your brain’s electrical activity goes through a five-phase cycle. A short afternoon catnap of 20 minutes yields mostly Stage 2 sleep, which enhances alertness and concentration, elevates mood, and sharpens motor skills. To boost alertness on waking, you can drink a cup of coffee before you nap.

When was the wireless phone invented?

A jazz musician named Teri Pall invented a version of the cordless phone in 1965 but could not market her invention, as its 2-mile (3.2 km) range caused its radio signals to interfere with aircraft communications. In 1968, she sold her rights to the cordless phone to a manufacturer who modified it for practical use.

What is ‘treeman syndrome’?

Epidermodysplasia verruciformis (EV), also known as treeman syndrome, is an extremely rare autosomal recessive hereditary skin disorder associated with a high risk of skin cancer. It is characterized by abnormal susceptibility to human papillomaviruses (HPVs) of the skin. As a result of the disease, the patient’s hands and feet become covered with extensive wood-like warts.

Why does turkey make you sleepy?

Contrary to popular belief, eating turkey isn’t the main reason you feel sleepy after a Thanksgiving feast. The oft-repeated turkey myth stems from the fact that turkey contains the amino acid tryptophan, which forms the basis of brain chemicals that make people tired.

Why do lights flicker in the distance?

When you stand on the ground and look at the stars, about 100% of the Earth’s atmosphere is above your head, so the light from stars has to pass through the turbulent air of the troposphere, where it is refracted, giving it a twinkling appearance. From an aircraft, this same thing happens with city lights.

Who named Pennsylvania?

Although Swedes and Dutch were the first European settlers, William Penn, a Quaker, named Pennsylvania in honor of his father by combining the name Penn and the Latin term sylvania, which translates as “woodlands,” to come up with “Penn’s woodlands.”

What element burns in contact with water?

This page describes the reactions of the Period 3 elements from sodium to argon with water, oxygen and chlorine. Sodium has a very exothermic reaction with cold water producing hydrogen and a colourless solution of sodium hydroxide. Magnesium has a very slight reaction with cold water, but burns in steam.

Why are there 13 stripes on the US flag?

The 50 stars on the flag represent the 50 states of the United States of America and the 13 stripes represent the thirteen British colonies that declared independence from the Kingdom of Great Britain and became the first states in the Union.