NASA launched a high-altitude scientific balloon from Antarctica carrying the GAPS experiment to search for antimatter particles, which could provide insights into dark matter; the balloon reached 120,000 feet, enabling frontier astrophysics research at a fraction of space mission costs.
Construction of the border wall along the Arizona-Mexico border has continued under President Biden, despite his earlier promise not to add to Trump's wall. The administration waived federal laws in Texas for new wall construction to manage increased migration. The wall expansion is funded by Congress-approved money from 2019. Gaps in the Arizona border wall are being closed, raising environmental and humanitarian concerns. Construction has led to large groups of migrants arriving at resource centers. The closure of gaps near Nogales began in May, but it is unclear if construction is complete.