When did mouth to mouth resuscitation begin?

When did mouth to mouth resuscitation begin?

1956 Peter Safar and James Elam invented mouth-to-mouth resuscitation. 1957 The United States military adopted the mouth-to-mouth resuscitation method to revive unresponsive victims. 1960 Cardiopulmonary resuscitation (CPR) was developed.

Why does the sun lighten our hair and darken our skin?

Melanin is a pigment found in your skin and hair cells that gives each its color. It does seem weird that the sun bleaches our hair and darkens our skin. This mostly has to do with hair being dead and skin being alive. The sun bleaches and destroys the melanin in your hair giving you lighter hair.

Why does water boil faster with salt?

If you look at the heat capacity of salt water, you will find that it is less than pure water. In other words, it takes less energy to raise the temperature of the salt water 1°C than pure water. This means that the salt water heats up faster and eventually gets to its boiling point first.

Who narrates Rudolph the Red Nosed Reindeer?

On the evening of December 6, 1964, families sat down to watch a new TV show for the first time: an animated special called Rudolph the Red-Nosed Reindeer. It featured the voice of Burl Ives as Sam, a singing snowman, who narrates the tale of a misfit reindeer who finds his own special way to shine.

How long was a Roman mile?

The Romans used a unit of distance called the mille passum, which literally translated into “a thousand paces.” Since each pace was considered to be five Roman feet—which were a bit shorter than our modern feet—the mile ended up being 5,000 Roman feet, or roughly 4,850 of our modern feet.

How much does a square foot of granite weigh?

The weight of granite depends on its density. The average 3/4″ thick granite weighs 13 pounds per square foot, 1 1/4″ thick granite weighs around 18 to 20 pounds per square foot, and 2″ thick granite weighs about 30 pounds per square foot.

How much of the earth’s atmosphere is made up of nitrogen and oxygen?

It is primarily composed of nitrogen (78%) and oxygen (21%) with only small concentrations of other trace gases. Nearly all atmospheric water vapor or moisture is found in the troposphere, so it is the layer where most of Earth’s weather takes place.

Why do golfers yell 4?

Yelling “fore” is simply a shorter way to yell “watch out ahead” (or “watch out before”). It allows golfers to be forewarned, in other words. Any golfer who hits an errant shot that sends their golf ball hurtling toward golfers ahead should yell out “fore” as a warning.