STEEM on a run?

The value of STEEM seems to have risen dramatically over the past few hours. Just last week it was down to 0.0003 and now it's been hovering around 0.0020. My brother in law texted me from Australia this morning. SELL SELL SELL he screamed.

I'm not an expert in currency markets but there's normally a cause and an effect. Why the sudden upturn?

I'd like to think it was down to Brexit but that's another story...