Some fancy SSDs have additional DRAM cache:

The presence of a DRAM chip means that the CPU does not need to access the slower NAND chips for mapping tables while fetching data. DRAM being faster provides the location of stored data quickly for viewing or modification.

Source

The psittacosis pandemic of 1929-1930 would be my guess.

It was mentioned in the psittacosis article someone posted.

“Other Half” would be my guess.