Sort:  
  • Trending
    • [-]
     8 years ago 

    Very clear video. Excellent to use it in a classroom!

    Coin Marketplace

    STEEM 0.09
    TRX 0.31
    JST 0.030
    BTC 109987.17
    ETH 3726.01
    USDT 1.00
    SBD 0.62