Rachel Annabelle Riley (born 11 January 1986) is an English television presenter who currently co-presents the Channel 4 daytime puzzle show Countdown and its comedy spin-off 8 Out of 10 Cats Does Countdown. A mathematics graduate, her television debut came when she joined Countdown at age 22.With a passion for popularising maths and the sciences, she has gone on to co-present The Gadget Show on Channel 5 (2013–14) and It's Not Rocket Science on ITV (2016). In 2013 she was a contestant on the BBC celebrity dance show Strictly Come Dancing. Wikipedia
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