سلتك فارغة
Thirsty card trick
I bet I can balance a plastic card on the rim of a glass full of water, and I can even place some coins on the overhanging part of the card without the card tipping over.
الفيزياء
العام الدراسي 7 – 12
مؤلف: Stonawski Tamás
المراجع: Dr. Sós Katalin
رابط الموزا
/رابط الشبكة