Cambridge Science Festival hosts U.S. debut of 'Borealis' light display

Swiss artist and activist Dan Acher spoke to Radio Boston host Tiziana Dearing at WBUR CitySpace just before the U.S. launch of his exhibition, "Borealis." The installation is visible between 8 and 11 p.m. in Cambridge's Kendall Square through Oct. 9. Acher also discussed another project, "Secrets," bringing himself and many in the CitySpace audience to tears.