Tonight on PBS

PBS News Weekend, the rising number of bowel cancer cases and the promise of new treatments on the horizon.

Then what's behind the promise of new treatments on the horizon.

Then what's behind the lack of affordable rentals in Austin, Texas,

even as rents there, are dropping?

And how our appetite for big amounts of internet data has even bigger costs to the environment.

Researchers think they're in the top 10 water consuming industries in the US.

They use 2% of the electricity in the US, which is a lot.

And a source told me that data center campuses

can use the resources equivalent to a small city. Good evening. I'm John Yang. It's a tale of extremes across the United States, oppressive heat, wildfires, and flooding hitting many parts of the country.

From the Midwest to the East Coast, millions of people are searching for relief from record-setting temperatures. In many places it feels

hotter than 100 degrees and it's only the beginning. The heat wave is

expected to last all weekend affecting people from the Ohio Valley to the

mid-Atlantic and prompting health warnings.

I don't know how long this is going to continue. It's just horrible.

You have to be outside, be outside for only a minimal amount of time, as much as needed.

Definitely drink a lot of water time as much as needed.

Definitely drink a lot of water, always stay hydrated.

The extreme weather is affecting travelers too.

Amtrak warns customers that some Northeast Corridor trains

are traveling at slower speeds because of the heat.

That's causing delays of up to an hour. In the west, a wildfire in New Mexico has taken root and spread quickly.

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