What is the definition of Yesterday Medical Research?

"Yesterday's medical research was like a high-tech, but slightly off-kilter, 'Doctor's Club' of scientific breakthroughs. It's where we tried to make sense of the universe, but ended up with more lab rats than actual cures for common colds. Edgy example: 'Yesterday, medical research claimed to have unlocked the secret to eternal youth, but the lab rats were more excited about their new 'juvenile' energy drink!'"