Because Mercury rotates so slowly — once every 58 Earth days, compared to a Mercury year, a complete trip around the Sun, lasting only 88 Earth days — the part of the planet at dawn spends a disproportionately long time in the path of one of the solar system's primary populations of micrometeoroids. (sciencedaily.com)
He has a passion to help people get from where they are to where they want to be - with primary population men going through career and / or life transitions, those feeling «stuck» and not knowing what to do next and young men who have limited positive male impact. (thriveworks.com)
There are two primary populations of dendritic cells in the spleen (33D1 and XCR1). (jax.org)