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this week, we're diving into the world of artificial reefs. the advantage to this is you can take all of the best qualities of a natural reef and you can exaggerate them, completely. the robots have come to town. and paul finds out how old bangers are being given an afterlife. it's an engine ina dishwasher... 'course it is! our oceans and the marine life they support are under threat. climate change is causing them to warm at record levels and as the seas absorb more co2 they also become more acidic. and that as well as other man—made damage like trawling for fish can have a devast...

leader to retreat. yevgeny prigozhin, the head of the wagner mercenary group, has been pictured apparently leaving the russian city of rostov—on—don — along with his troops. only yesterday a heavily armed column of wagner troops was heading from rostov—on—don towards moscow, where defences were being prepared. those troops got to around 300 miles south of the russian capital. then, at around 6.30pm uk time, prigozhin announced that he had agreed to stop the advance, in a deal brokered by the belarusian leader. with all the details, here's our eastern europe correspondent sa...

my innovation journey starts inland, south of morocco�*s major cities and mighty atlas mountains, just north of the sahara desert, near the quiet outpost of ouarzazate. this part of saharan morocco is known as the door of the desert. the landscape out here, it's almost like it's from another world. feels like we could be on mars. these plains receive three times the sun as parts of northern europe... ..and are home to a world—leading project of staggering scale. this is noor, a solar power station, putting morocco at the forefront of pioneering renewable technology. i'm used to f...

that blue state. we begin with the january 6 committee and nbc capitol hill correspondent ali vitali. brendon buck and kimberly atkin-store and sam stein. ali, is it possible that chairman thompson's absence could push this hearing or are they determined to keep this schedule? >> reporter: they are determined to keep this schedule, chris. especially because what's clear yesterday after my conversation with chairman thompson, who i would note was wearing a mask when he was talking to us yesterday, he seemed to leave the door open as all of the committee members have to the idea ther...

successfully blocked a russian advance at a key river. you can see pontoon bridges destroyed. it's not entirely clear who blew them up. the ukrainians say it was them. russia almost three months into its invasion of ukraine. on friday, russia's top general finally accepted a call from lloyd austin. the first call in 84 days, the first since this war began. the pentagon says they spoke for an hour but gave no detail beyond saying the u.s. repeated its call for an immediate cease-fire and to keep the lines of communication open. so far, the kremlin has been silent. and at the old but...