.@BBCRosAtkins warming up the audience in Kampala - what's your perception of science in Africa? #BBCWhatIf #whys

Cecile in Vatican City - listening in to #whys getting reaction from Nairobi, Delhi, UK to #Pope Francis

Father Ricardo from Argentina talking to @BBCNuala in Vatican City on #Pope Francis #whys

@BBC_WHYS wat type of laws u xpect indians, these r d indian law makers #WHYS

@gelhaddad On #BBC YOU are corrupt There is no dignity in #IKHWAN we hope your happy you are killing us #Egypt #WHYS

Claire from Houston surprises the #bbclondoncalling conversation with her all American nails #whys #olympics

Thanking You Kindly @BBC_WHYS #WHYS from #Nairobi

Check out @alykhansatchu in our Nairobi studio talking #banking on #whys

Madhattters Annie, Jean and Wendy #bbcjubilee #whys

I'll be chatting with this 20 strong clan that are also a choir 11g #whys #bbcjubilee #jubilee

Look who just served me at Pret! #jubilee #whys

Splendid sky in Trafalgar Square beside #whys location for today's show. #jubilee

Pupils at International School Suva in Fiji taking part in #bbcassembly ! #whys

Our Jamaican pupils in their school uniforms #whys #bbcassembly

Pupils at Usain Bolt's old school in Falmouth, Jamaica are well and truly connected to #whys #bbcassembly !

Pupils in Jamaica linking up with Libya, London and Accra #bbcassembly #whys

Here are the students at the Multikids Academy in Accra, Ghana taking part in #bbcassembly #whys

Jumping into the global conversation at Langdon Park School in East London #bbcassembly #whys

Omar talks about a new music trend called 'the grime' in East London #bbcassembly #whys

Omar talks about a new music trend called 'the grime' in East London #bbcassembly #whys

Omar and Chanel in London listening to #bbcassembly #whys

Jasmine in London chatting to students in Jamaica,Ghana&Washington DC - the world's biggest school assembly #whys

We're on air in 30 mins: rehearsing with pupils at Langdon Park School in East London #whys #bbcassembly

Chanel & Jasmine before we go on air in East London - they'll be talking to Ghana, Jamaica and Washington DC #whys

Pupils at Langdon Park School in East London posing with mics ahead of the 17gmt show #whys #bbcassembly