How rising oxygen may have triggered the Huronian ice ages

Rising oxygen may have helped trigger ancient ice ages

When oxygen began rising in Earth's atmosphere, it likely destroyed some methane, a powerful heat-trapping gas. This weakened the greenhouse effect and may have helped trigger the Huronian ice ages.

Some elevators send electricity back to the building

An elevator can return electricity to its building when a cab heavier than its balancing weight descends, or a lighter cab rises. The motor then acts as a generator, recovering gravitational energy much like regenerative braking in a vehicle.

The 13th Amendment left a forced-labor exception

The U.S. 13th Amendment abolished slavery but allowed forced labor as criminal punishment. That exception provided a legal basis for convict leasing, a practice that primarily affected African Americans.

Like this? There’s a whole feed of it. Replace empty scrolling with things worth knowing.

Download Hence for free

How rising oxygen may have triggered the Huronian ice ages

Rising oxygen may have helped trigger ancient ice ages

Keep exploring