Built a 12-card memory deck for cell signaling today. If anyone wants the mnemonic that helped me remember receptor tyrosine kinases, I can post it in the comments.

Can someone explain why the ratio test fails for alternating harmonic series intuition-wise? I understand the computation but not the bigger picture.

Finished my studio model before sunset and still had energy to review history notes. Tiny systems really work: timer, tea, then one page at a time.