IN: Alexander Bell was born in Edinburgh, Scotland, on March 3, 1847. The family home was at 16 South Charlotte Street, and has a stone inscription marking it as Alexander Graham Bell's birthplace. He had two brothers: Melville James Bell (1845-70) and Edward Charles Bell (1848-67), both of whom would die of tuberculosis. His father was Professor Alexander Melville Bell, a phonetician, and his mother was Eliza Grace (nee Symonds).

As a child, young Bell displayed a natural curiosity about his world, resulting in gathering botanical specimens as well as experimenting even at an early age. His best friend was Ben Herdman, a neighbour whose family operated a flour mill, the scene of many forays. Young Bell asked what needed to be done at the mill. He was told wheat had to be dehusked through a laborious process and at the age of 12, Bell built a homemade device that combined rotating paddles with sets of nail brushes, creating a simple dehusking machine that was put into operation and used steadily for a number of years. In return, Ben's father John Herdman gave both boys the run of a small workshop in which to "invent". From his early years, Bell showed a sensitive nature and a talent for art, poetry, and music that was encouraged by his mother. With no formal training, he mastered the piano and became the family's pianist. Despite being normally quiet and introspective, he revelled in mimicry and "voice tricks" akin to ventriloquism that continually entertained family guests during their occasional visits. Bell was also deeply affected by his mother's gradual deafness (she began to lose her hearing when he was 12), and learned a manual finger language so he could sit at her side and tap out silently the conversations swirling around the family parlour. He also developed a technique of speaking in clear, modulated tones directly into his mother's forehead wherein she would hear him with reasonable clarity. Bell's preoccupation with his mother's deafness led him to study acoustics. His family was long associated with the teaching of elocution: his grandfather, Alexander Bell, in London, his uncle in Dublin, and his father, in Edinburgh, were all elocutionists. His father published a variety of works on the subject, several of which are still well known, especially his The Standard Elocutionist (1860), which appeared in Edinburgh in 1868. The Standard Elocutionist appeared in 168 British editions and sold over a quarter of a million copies in the United States alone. In this treatise, his father explains his methods of how to instruct deaf-mutes (as they were then known) to articulate words and read other people's lip movements to decipher meaning. Bell's father taught him and his brothers not only to write Visible Speech but to identify any symbol and its accompanying sound. Bell became so proficient that he became a part of his father's public demonstrations and astounded audiences with his abilities. He could decipher Visible Speech representing virtually every language, including Latin, Scottish Gaelic, and even Sanskrit, accurately reciting written tracts without any prior knowledge of their pronunciation.

How old was he when he invented the dehusking machine?

OUT: at the age of 12, Bell built a homemade device that combined rotating paddles with sets of nail brushes,

input: Andrew Johns broke one of the longest-standing records in Round 2 of the 2006 season as he amassed 30 points against the Canberra Raiders and in doing so claimed the points-scoring record for a player at a single club, surpassing Mick Cronin's 1,971 points for Parramatta. Back in the NRL, playing for Newcastle during a Round 18 match against the Parramatta Eels, Johns' name entered the NRL record books for the second time in the year. A Johns conversion of a Newcastle try made Johns the highest points scorer in the 98-year history of first-grade rugby league in Australia, eclipsing Jason Taylor's previous record of 2,107 points. He rather coincidentally scored the record-breaking conversion in a 46-12 loss to the Eels, who were coached at the time by Jason Taylor. Things did not start well for Johns in the 2007 season as he lasted only four minutes into Round 1. As Canterbury Bulldogs forward Sonny Bill Williams went to perform one of his trade-mark hits on Johns, the tackle strayed high leaving Johns lying concussed. Williams pleaded guilty at the judiciary to a reckless high tackle, and received a two-week suspension for the hit. Johns missed the following match but returned in Round 3 against the Canberra Raiders--which would be his last career match in the NRL. On the Thursday after the Canberra match, a tackle with Newcastle teammate Adam Woolnough in a training session resulted in his referral to a specialist to examine a neck injury. It was revealed that Johns had a bulging disc in his neck. It was confirmed that this had been present for some time and was not related to the training incident. All medical advice was that Johns should retire from professional football, since any further neck injury could prove life-threatening and on 10 April 2007, Johns announced his retirement from rugby league. The Newcastle Knights' season would fall apart: they finished 15th of 16 teams on the ladder, narrowly missing out on the Wooden Spoon with a narrow two-point victory in their last match of the season. Johns tried to soften the blow of his retirement by saying he had been seriously considering retirement at the end of the 2007 season and was quoted in the press as saying "I knew this year would be my last year, it's just unfortunate it's stopped five months before the end of the season." Commenting on his teammates' reaction to his retirement, Johns noted: "They were sort of relieved I think, after a couple of injuries this year ... I think the time's right." On his retirement a chorus of past league greats called for Johns to be immediately honoured as an immortal of the game. In the preceding 13 years, the former Cessnock junior had changed the game like few others before him. On October 2008 Johns completed a walk from Newcastle to Sydney to raise funds for the Black Dog Institute.

Answer this question "did he go on to do anything else?"
output:
On October 2008 Johns completed a walk from Newcastle to Sydney to raise funds for the Black Dog Institute.