Sort:  

that's where it gets tricky. If you try to do these tricks for hundreds of different topics, I think they might lose their effectiveness. That's the reason why you don't constantly use it to study, only for certain tasks you have trouble with

Coin Marketplace

STEEM 0.22
TRX 0.26
JST 0.040
BTC 96549.02
ETH 3409.65
SBD 3.18