Day 3 and there’s no let up in the number of chats and questions – 4,400 students registered and nearly 2,500 answered questions, not to mention loads more chats!

Today’s highlights:

• 

  This horse isn’t fooling anyone… Image by FlickrLickr for Wikimedia

  They were discussing robotic hearts in the Indium Zone:

11sumnerh : could we survive without a heart could it be replaced with a robotic device?

christinapagel : yes we could! even now children wiating for a heart transplant can be fitted with artificial hearts that si outside their body (on their laps!!) and pump the blood round… but the longer you use them the more dangerosu it gets

christinapagel : and it gets dangerous becaue eventually your blood will clot inside the device and you get a stroke..

matildawyatt1999 : why arent people immortal if you can have a robotic heart?

jessbean : as for the robotic heart. that might still work but other bits of your body can get old and get damaged

• A student seems to want to look like a zebra over in the Reproduction Zone:

Would it be possible to pigment my skin so I look like a zebra?

• Student theantihiggs questioned New Materials Zone‘s Stuart about his research:

theantihiggs : why do you need to develop all of these new dyes instead of using the one that nearly all plants use every day, chlorophyll.

stuartarcher : the problem with chlorphyll is that is only works when it’s inside the leaf surrounded by all the other stuff that;s in there, such as proteins and other molecules, it doesn’t work well on it’s own. Plus, we don’t really understand fully how it works yet – there are people hoping to unlock it’s secrets for the same purpose. Also, the dyes we make are for studying the fundamental processes behind photosynthesis, we want to keep them nice and simple at first

• And an interesting fact from the Cells Zone:

How big is the biggest cell in the world?