+Sean Reynolds You might find this interesting since your daughter likes dinosaurs so much. They actually think they weighed much less than they previously thought and were probably a lot more graceful. 
Lasers are used for more and more things everyday. This is a fairly interesting article on how lasers helped to more accurately determine what dinosaurs really weighed.

http://www.history.com/news/2012/06/06/the-biggest-losers-dinosaurs-slim-down-with-lasers/ 
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