Because they have densities lower than that of air, some gases are buoyant in air and are used to fill lighter-than-air crafts like balloons, airships, and other aerostats. Heated air is also an effective lifting gas because the density of a gas decreases as its temperature increases as long as pressure remains constant. The acronym 4H MEDIC ANNA has been used by emergency responders to remember some of the common gases that are lighter than air. What does it stand for?
Back in the day
After a period of relative calm, border incidents between Israel and Syria, Egypt, and Jordan increased during the early 1960s. Palestinian guerrilla attacks on Israel from bases in Syria led to increased hostility between the two countries. After Egypt signed a defense treaty with Jordan, Israel launched a preemptive air strike against the three Arab states, capturing the Sinai Peninsula, Gaza Strip, West Bank, Old City of Jerusalem, and the Golan Heights. How many were killed in the fighting?
Born on a day like today
García Lorca was a Spanish poet, dramatist, and member of the Generation of '27, an influential group of poets that arose in Spanish literary circles between 1923 and 1927. His most famous works include the book Gypsy Ballads and his poem, "Lament for the Death of a Bullfighter." The poetry, passion, and violence of his works, which combine Spanish folklore with his personal experience, and his own tragic and bloody death brought him enduring international acclaim. How did he die?