Krishneel Nair from Suva wants to know: How do plants defy gravity?
Here's Yalda answering a few more questions of ours about her South Korean trip - but this time, no words allowed!
German Foreign Minister Frank-Walter Steinmeier has reiterated that Germany will not get involved in US and French airstrikes against Islamic State (IS) jihadists in Iraq and Syria. He also ruled out ground deployments.
Kenyan opposition leader Raila Odinga, on a visit to Berlin, has been talking about the security situation in his country, one year after the Westgate attack. He is also campaigning for a referendum on the constitution.
CERN is more than a unique research institute. It's about building bridges between nations and friendship between scientists from around the world, says its director Rolf-Dieter Heuer.
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