BBC8 个月
KS2 Science: How do muscles and bones work?
PRESENTER:'Our skeleton has over 200 bones from the largest - our leg bone, or our femur, to the smallest - the bones in our ears. PRESENTER:'Bones are made of calcium and other minerals.
Mystery as two human leg bones are discovered at Philadelphia park
A woman contacted police after catching sight of the bones at Penn Treaty Park near the Delaware River just before 5pm on ...