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Justin Bieber is in a race to the bottom ... but at least now he's got some attractive company. Bieber took a 1-on-1 hike with his model friend, Ashley Moore, who seemed down to get physical with him in a friendly competition running on a canyon trail.

On April 3, 1973, Martin Cooper made the first ever cellphone call on the streets of New York. His invention, a brick-sized device, became the first cellphone available to the general public.

Kirstie Alley was best known for her roles in Cheers and Drop Dead Gorgeous, but her favorite role was being a mom to her two kids. The actress, who died at 71 from cancer, was a mother to two children, William True and Lillie. The siblings confirmed the death of their "incredible, fierce and loving

Puppy fans can now follow the progress of one of Bedfordshire, Cambridgeshire and Hertfordshire (BCH) Dog Unit's newest recruits on Twitter. A police officer who's fostering Blade, the nine-week-old German Shepherd will be sharing his exploits and experiences on the unit's Twitter account (@dogpoliceBCH).

New Harry Potter covers in animated gifs Discover more great stories on the children's books homepage and the Harry Potter page