Harrison is joined by rapper and musician Kid Koala, a special guest canine, and opera singer Lindsay Michael.
Harrison finds out lots of new stuff about teeth, including why some are sharp and some are flat, why birds have beaks instead of teeth!
Harrison finds out how animals have been building structures for millions of years, as well as the best way to build structures.
How can Santa deliver billions of presents to the whole world in just one night? With Santa's exhilarating, high-tech operation hidden beneath the North Pole! So how could this incredible operation have missed one child? To Santa's young son, Arthur, it threatens to end the magic of Christmas. With retired Grandsanta, a rebellious young elf, an old sleigh and some untrained reindeer, Arthur sets out in a crazy mission to deliver the last present.
Buddy, a human raised as an elf, is sent to the US in search of his true identity after nearly bringing Santa's operation to a catastrophic standstill due to his size.
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This animated adventure, from acclaimed anime master Hayao Miyazaki, centres on five-year-old Sosuke and his friendship with Ponyo, a goldfish princess who longs to become human. When a powerful magic threatens to destroy the world, the two friends embark on the adventure of a lifetime to save the planet.
Stories include, 'Malaysia deal in ruins', 'Scott Morrison joins 7.30', 'Funding row over domestic violence alarm', 'John Cleese joins 7.30'.
Harrison finds out if girls grow faster than boys and if you can make yourself grow taller.