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Max Pearson presents a selection of this week\\u2019s Witness History stories.

In 1999, Aibo: the world's first robot dog, hit the shops in Japan and sold out in just 20 minutes.

We hear from Toshitada Doi who spent six years on the project when he worked at Sony. Plus we hear from Dr Ella Haig about the development of artificial intelligence.

Japanese software developer Shigetaka Kurita created the first emoji in 1999.

Valerie Hunter Gordon, from England, invented disposable nappies in 1947 after the birth of her third child. We hear from Valerie\\u2019s son, Nigel Hunter Gordon.

Hungarian journalist L\\xe1szl\\xf3 B\\xedr\\xf3 was sick of smudging the ink from his fountain pen and so he invented the ballpoint pen in 1938.

Finally, a Hungarian architect Ern\\u0151 Rubik invented what's known as the Rubik's Cube.

Contributors:

Toshitada Doi on developing Aibo: The world's first robot dog\\nDr Ella Haig, Reader in Artificial Intelligence, in the School of Computing at the University of Portsmouth in the UK\\nJapanese software developer Shigetaka Kurita, who created the first emoji\\nNigel Hunter Gordon, the son of Valerie Hunter Gordon, on disposable nappies\\nHungarian journalist L\\xe1szl\\xf3 B\\xedr\\xf3, the inventor of the ballpoint pen\\nHungarian architect Ern\\u0151 Rubik, the inventor of the Rubik's Cube

(Photo: The original Aibo. Credit: Jun Sato/WireImage via Getty Images)