Many of Ukraine’s historic monuments have been destroyed in the three months since Russia invaded, but cultural experts are working to conserve their memory using cutting-edge technology and 3D scans. One of them is volunteer French engineer Emmanuel Durand, a specialist in 3D data acquisition, who is assisting a bevy of architects, engineers, historic building experts and a museum director to record buildings in Kyiv, Lviv, Chernigiv and Kharkiv. Durand steps over a jumbled pile of beams and crunches over the rubble that was once Kharkiv’s 19th-century fire station. He plants his laser scanne…