A cardiac surgeon ignored his own heart attack symptoms. He says anyone can miss the red flags.

Tech Insider : Business, Environment
A doctor in blue scrubs and a stethoscope
Dr. Jeremy London, a cardiac surgeon, was shocked when he suffered his own symptoms of a heart attack in his 40s. It prompted major changes to his health routine.

Courtesy of Rorra

The US Army hasn't faced serious threats from above in years. The war in Ukraine is forcing a rethink.

Tech Insider : Business, Environment
A man in camouflage gear looks through binoculars with a grey sky and almost-bare trees behind him
Ukraine shows the US it may not be guaranteed control of the air in a future war, and soldiers will have to be far more suspicious of what's flying above them.

Spc. Richard Carlisi

Head of OpenAI's Codex explains the kind of email that gets his attention — and his advice to young engineers

Tech Insider : Business
OpenAI's Codex logo on a smartphone.
Alexander Embiricos shares what emails catch his eye.

Nikolas Kokovlis/NurPhoto via Getty Images

Russia can't match NATO's conventional strength, so it's betting on submarines and nuclear asymmetry, commander says

Tech Insider : Business
A Russian submarine is followed by British ships in the English Channel in 2025.
British forces track a Russian submarine in December.

Royal Navy

These 7 companies are increasing hiring of entry-level engineers

Tech Insider : Business, Environment, Technology
two people looking at computer screen
While some may be reluctant to hire junior developers, others are doubling down on the talent pool.

picture alliance/dpa/picture alliance via Getty Images

A buzzy data center startup calls itself a utility. That could be a problem.

Tech Insider : Business, Technology
Toby Neugebauer and Rick Perry

Bloomberg/Getty Images

I quit my job at TikTok at age 30 to travel. There was no way I was going to stay — the freedom is worth it.

Tech Insider : Travel, Travel, Business
a woman on a motorbike poses on a mountain
Nerine Mak

Courtesy of Nerine Mak.

OpenAI salaries revealed: How much the ChatGPT maker pays AI researchers, engineers, and other key roles

Tech Insider : Business
Sam Altman with a finger to his lips, wearing a suit in front of a black and orange background.
OpenAI cofounder and CEO Sam Altman.

Nathan Howard—Bloomberg/Getty Images/Reuters

Sales startup Letter AI snags $40 million Series B four months after its last raise. Read its pitch deck.

Tech Insider : Business, Technology
Headshot of Letter AI cofounder and CEO Ali Akhtar, wearing a black collar shirt, glasses, and a blue background.
Letter AI cofounder and CEO Ali Akhtar

Letter AI

'A band-aid on a serious wound': More student-loan borrowers are at risk of Social Security and tax refund seizures once Trump's pause lifts

Tech Insider : Economy, Business
President Donald Trump
Millions of student-loan borrowers are at risk of losing their federal benefits once President Donald Trump's pause on garnishments lifts.

Nathan Howard/Getty Images

Subscribe to Business