Every morning, we comb through YouTube's search data to investigate top spiking search terms and the videos they lead to:

• gas explosion philadelphia - This morning's top search is for a serious gas explosion in Philadelphia that was caught on tape.
  
  
• ice pittsburgh - Searches are rising for footage of these cars sliding and colliding down an icy hill in Pennsylvania.
  
  
• robert bentley - The new Alabama governor was inaugurated in yesterday.
  
  
• piers morgan howard stern - For the second day in a row, CNN's Piers Morgan was among our rising searches, this time for his interview with Howard stern in which the shock jock blasted comedian Jay Leno.
  
  
• federer simon - Roger Federer overcame Gilles Simon for a tough win in the Australian open.