Nikola Tesla died alone and in debt despite his inventions.

Harriet Tubman never lost a single passenger on the Underground Railroad — she made 19 missions and freed approximately 70 enslaved people.

Solar panels are made from silicon wafers and convert sunlight into electricity through the photovoltaic effect.

Small daily expenses can add up to large lifetime costs.

The availability heuristic makes people overestimate the likelihood of memorable events.

The last guillotine execution happened in 1977.

COINTELPRO was an FBI program aimed at monitoring and disrupting political organizations.

The Trans-Siberian Railway, completed in 1916, stretches 9,289 km and is the longest railway line in the world.

Social media's algorithmic feeds are optimized for engagement — which often means prioritizing emotionally charged content.