A type of selection bias in statistical analysis, caused by loss of participants (attrition) in the course of a study; the subjects that do not run into completion of the study may differ systematically of those who do.

(biology) The Cambrian explosion (the rapid appearance, around 541 million years ago, of most major animal phyla).

Synonym of Great Resignation

plural of bicycle crunch

(exercise) A type of exercise in which one touches alternating knees with the opposite elbow while performing a crunch.

plural of archipelago big-eyed treefrog

plural of Bible-thumper