Twenty-two of the 24 Democratic 2020 presidential candidates. Reuters

Why are there so many candidates for president?

The number of candidates in presidential primaries has skyrocketed since the 2016 election. Divisions inside political parties and easy ways for candidates to raise money are among the reasons why.
Many people believe in the idea of a soulmate - one person who will make us whole and happy. fizkes

What’s behind the belief in a soulmate?

Many of us go through life in the hope of finding the ideal soulmate -- our missing half. The reason may be deeply embedded in religious beliefs.
Biometrics like retinal scans is a new frontier in the privacy wars. Reuters/Mike Blake

Congress is considering privacy legislation – be afraid

States like California have been at the forefront of privacy innovation in recent decades. A possible federal law could bring their experimentation to a halt, harming consumers.
The San Pedro Mezquital River is the last free-flowing river in Mexico’s western Sierra Madre. Octavio Aburto

Hydropower dams can harm coastal areas far downstream

Thousands of hydropower dams are under construction around the world. New research shows that by cutting off sediment flow, these dams can have big ecological effects on far-off bays and deltas.

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If trainers start stretching Lebron James’ muscles to match the textbook values of the general population, he may start jumping like the general population. Philip Anloague, University of Dayton

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