Mouse sperm parties make for straight swimmers
Instead of boosting speed, grouping helps male reproductive cells travel in a uniform direction
![](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2014/07/na_sperm_aggregate.jpg?fit=860%2C460&ssl=1)
SPERM CREW Traveling in a straight line comes easier for groups of sperm than for solo swimmers in two mouse species.
© James Weaver/Wyss Institute/Harvard Univ.