What was the event in April causing a spike in both searches?
US government shutdown almost happened but was averted by last-minute stop-gap deal (which ultimately resulted in an partial government shutdown months later)
Cypriot bank craziness, perhaps?
Bitcoin was in one of its bubbly phases at the time.
US government shutdown scare. The debt ceiling crisis + government shutdown of October may have contributed to bitcoin's rise this time around. Another one looks to be coming up in January / February