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The discovery of the Higgs Boson is the focus of the debate.
Dr Karl tells us it could take anytime between 10 and 100 years for the discovery of the Higgs Boson particle to be put to practical use. But he admits he has no idea what practical use that could be.
David from Birmingham asks if the discovery is just going to raise more questions than it answers. Dr Karl is emphatic. Yes. And says that makes it an exciting time to be a scientist!
You can also the learn the difference between an asteroid and a meteorite.