Two recently discovered bird fossils from the Late Jurassic Zhenghe Fauna demonstrate that highly derived bird-like features and the origin of birds appeared much earlier in the Jurassic period ...

Alexandra Twin has 15+ years of experience as an editor and writer, covering financial news for public and private companies. Ebony Howard is a certified public accountant and a QuickBooks ...

Tetralogy of Fallot (TOF) is a combination of four congenital (present at birth) heart defects that affect infants and children. The defects occur together and change the way blood flows through the ...