b'2018-2019 YEAR BOOKStatement of ActivitiesJuly 30, 2019, and 2018(in thousands)2019 2018 71Revenue and SupportGrants and contracts $20,526$26,907 Contributions, gifts 7,9877,681 Other Income 7,559 4,232 Net External Revenue 36,07238,820 Investment income and unrealized gains 31,22195,665Total Revenue $ 67,293$134,485ExpensesProgram and Supporting Services:Terrestrial Magnetism 10,039 9,882 Observatories 23,05522,886 Geophysical Laboratory 13,29419,711Embryology 14,697 12,764 Plant Biology 9,36010,118Global Ecology 7,123 6,944 Other programs 1,013 849Administration and general expenses 14,968 13,478 Total Expenses $ 93,549 $96,632Change in net assets before pension related changes (26,256) 37,853 Pension related changes (2,611) 1,773Grant modifications (5,188)Net assets at the beginning of the period 1,058,8231,019,197 Net assets at the end of the period $ 1,024,768$1,058,823'