There is centennial and there is bicentennial; is there a word to desdribe the 150th anniversary of something? Thank you.
'Moon trees' were trees grown from seeds that orbited the moon onboard Apollo 14. Two trees were given to each US state to honor the bicentennial festivities in 1976 but no list of locations was kept. Now a NASA scientist is trying to track them down. I'd like to find one in Rhode Island but he's missing quite a few. Anyone know of one not on his list?