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Welcome to Tech News briefing. It's Tuesday, August 27th.

I'm Zoe Thomas for the Wall Street Journal.

Climate change has made heat waves longer and more intense,

raising the risks for people who work outside in hotter regions or in spaces like large

warehouses without air conditioning. New high-tech personal cooling systems though

are fighting the effects of heat. We'll tell you how they work.

Amen. Tether, the company behind one of the world's most popular

crypto currencies, is investing in companies that seem unrelated to its core business. What do they have in common?

Connections to a colorful financier. Our reporter Ben Foldy will join us to talk about

what's going on.

But first, when you are in intense heat, your body works really hard to cool itself down. Extreme

heat increases the risk of strokes, heart attacks, and severe dehydration. But wearing something that can conduct

heat away from your body, like new high-tech ice packs, can allow people to stay in very

hot conditions longer.

Here to tell us more about the companies developing these is our tech columnist Christopher

Memes.

So Christopher, in a broad sense, how do these systems work to cool the body?

There's a lot of ways to cool the body, some of which are more effective than others,

...