A wildfire in Yosemite National Park in the US state of California has become so large it can now be seen from space in Nasa satellite images
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Scientists are researching a blood test which can quickly detect colon, lung, breast, stomach and endometrial cancer.
Transport bosses are said to be in "active discussions" with the company to encourage it to extend its pilot scheme to the UK's capital.
Reports suggest the 67-year-old is expected to be named as one of the hosts of the new series within days.