TechnologyExperimental XB-1 aircraft goes supersonic for the first time Boom Supersonic’s XB-1 aircraft broke the sound barrier during three test runs, a step toward the possible return of supersonic commercial flights ¿ìè¶ÌÊÓÆµ
EnvironmentSetting fire to a million acres of California could cut smoke by half As California expands its prescribed burning efforts, a study of more than 180 such projects suggests they are an effective way to reduce a blaze's intensity and smoke ¿ìè¶ÌÊÓÆµ