text: arey,kya tumne youtube par koi achha educational channel dekha hai? maine suna hai ki wahan pe bhi kaafi useful content milta hai, tumhara kya experience hai?haan, maine 'crashcourse' dekha tha, unka presentation style toh zabardast hai, mujhe toh lagta hai ki woh boring subjects ko bhi entertaining bana dete hain, kya tumne dekha?