Newsworthy Clip 3

Forefront - leading position; he is in the forefront of the heart surgery field
Emerge - coming out, growing, becoming more popular; The sun is emerging from the behind of the mountain
Human tissue - 人體組織;
Bladder - 膀胱, the bladder store the wasted water in our body
Organ - 器官; The human organ is very fragile
Implant - 植入; John implanted an artificial heart pump in his body.
Tinkering with the car - trying to fix the car
Progenitor - earliest form, the source from which something is descended
Milestone - an important event in the development of something
Sidestep - to avoid gracefully
Controversial - 爭論的, against; This sidesteps the controversial use of embryonic stem cell
Specimen - 樣本, sample
Tumor - 腫瘤
Stem cell - 幹細胞
Amniotic fluid - 羊水
Placenta- 胎盤
Embryonic stem cell - 胚胎幹細胞
Nerve - 神經
Liver - 肝臟
Pancreas - 胰腺
Stem cell - a cell that doesn't have a clear identity, it can be define as any cell you want it to be