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This Russian short-range cruise missile, the Iskander-K, can carry nuclear warheads for several hundred miles. Russian Defense Ministry Press Service photo via AP

What are tactical nuclear weapons? An international security expert explains and assesses what they mean for the war in Ukraine

Tactical nuclear weapons were designed to be used on the battlefield rather than for strategic defense, but that doesn’t mean there’s a plausible case for using them.
Some areas wouldn’t see immediate effects, and there could be serious consequences. Buda Mendes/Getty Images

Solar geoengineering might work, but local temperatures could keep rising for years

Injecting reflective particles into the atmosphere won’t immediately cool the entire planet. A new study shows how parts of the US, China and Europe might still see temperatures rising a decade later.
Didymos (bottom right) and its smaller moonlet Dimorphos (center) were the targets of the Double Asteroid Redirection Test. NASA/Johns Hopkins APL

NASA crashed a spacecraft into an asteroid – photos show the last moments of the successful DART mission

The Double Asteroid Redirection Test successfully showed that it is possible to crash a spacecraft into a small asteroid. Whether the approach could save Earth from a future threat remains to be seen.
More EV charging hookups in public locations like garages and parking lots would prompt more drivers of color to buy EVs. Extreme Media via Getty Images

People of color are as interested in buying electric cars as white consumers – the biggest obstacle is access to charging

Reducing air pollution from cars and light trucks would pay big health dividends for low-income and minority communities. A new survey shows how to get more drivers of color into electric vehicles.
After a mistake, people may try to correct the error with an intentional wrong judgment, this time in favor of the previously wronged party. Ed Zurga/Getty Images Sport via Getty Images

Two wrongs trying to make a right – makeup calls are common for MLB umpires, financial analysts and probably you

Erroneous calls increase the chances of subsequent calls in favor of the person who was harmed. What drives this behavior, and do people even recognize they’re doing it?
Cash is pretty convenient. Dilok Klaisataporn/EyeEm via Getty Images

Why does money exist?

Paying for the stuff you want with currency is way easier than relying on chairs you made or chickens you raised.