isaac newton. impress, yes, but we're here for bones that are older 155 million years older. we're hoo here for dinasaur. we're calling him little al >>> if you're thinking castles and kings, think again. >> we're going to start at 150,000 pounds >>> techknow has travelled here to attend an auction of a very unusual piece. meet al. the juvenile alisaurus. there it is. that is amazing. how old is this? >> this is about 155/160 million years >>> these men are two key players behind what will be a true techknow adventure. he is the curator of this action and the owner of the auction house. what stands out to you, what makes this so unique? >> first of all, it's a juvenile alisaurus. it is rare and unique thing. this is the best example of a juvenile one. >> you can see the teeth, they're very sharp. they're designed for grabbing on and not lesing go. these are for cutting and slicing >>> between 300,000 and 500,000 british pounds >> if you walk in to a dinner party and see that, you will say, god, what is that >>> is there an appeal for this? >> they're iconic, aren't they >>> t