gas

Home » gas

West Asian environment – Little Ice Age to global warming

By |2018-04-25T23:04:59+00:00September 11th, 2017|Environment, West Asia|

Iraqi oil production (2000s AD) In the 1500s AD, a global cooling period known as the Little Ice Age affected people all over the world, from the Navajo and Iroquois in North America to the French in Europe and the Mongols in Central Asia. West Asia was no exception. In the Ottoman Empire, after the death of Suleiman the Magnificent, it was very cold and there [...]

What are planets? Astronomy – Space science

By |2018-09-10T17:46:23+00:00August 19th, 2017|Physics|

What are planets? The planet Venus from space Before there were planets For several hundred million years after the Big Bang, there were no planets, only stars. Planets couldn't form until the first stars ran out of fuel and exploded into supernovas, about 14 billion years ago. The supernovas spewed out thousands of tons of carbon, oxygen, iron and other elements into space. Planets [...]

Jupiter – Planets – Astronomy

By |2018-05-31T11:49:17+00:00August 18th, 2017|Physics|

Jupiter from space Jupiter (named after the Roman god Jupiter) is the next planet further out from our Sun after Mars. But Jupiter is much, much further away from the Sun than Mars is. If the Sun were the size of a penny, then Earth would be about six feet away from the Sun. And Mars would be about ten [...]

Blackfoot get horses – American history

By |2018-04-08T11:21:53+00:00August 12th, 2017|History, Native American|

Blackfoot man with horse Throughout the 1500s and 1600s AD, the Blackfoot continued to live in the same way they had lived before 1500. But the lives of Blackfoot people changed a lot in about 1730 AD, when they got horses from other North American tribes. Once they had horses, they could hunt bison and get their food more easily [...]

European Warfare – Military history

By |2018-04-20T08:25:05+00:00August 7th, 2017|Modern Europe, War|

British cannon from the Hundred Years' War (now at Mont St. Michel) Not long before 1500 AD, everything medieval soldiers did in wars suddenly changed. First, Europeans learned how to make and use gunpowder from Central Asian scientists, and they put gunpowder into metal cannons. Once you had cannons, you could blow holes in thick castle walls and in soldiers' armor, and [...]

Farming and famine – Climate change

By |2018-04-19T14:44:11+00:00June 20th, 2017|Environment|

Climate change: Hunters, bison and aurochs Cave painting from Lascaux, ca. 15,000 BC Climate change encouraged the evolution of the first humans, who probably evolved in Africa as the climate got drier and grasslands replaced jungles. People came down from the trees and evolved to swim and fish. They learned to walk upright [...]

Sharecroppers and cotton – American History

By |2018-04-18T18:43:37+00:00June 8th, 2017|Clothing, North America|

Sharecroppers and cotton: Cotton pickers in the 1800s AD Slavery and the cotton gin The invention of the cotton gin in 1793 AD made it possible for enslaved people to produce cotton cheaply enough so cotton was now the cheapest kind of cloth. Tens of thousands of black people worked hard as slaves [...]