Bin Cheng undertook a month long research visit to America this spring (3 to 28 March) travelling from Maryland on the east coast to California on the west coast. He gave a talk at the University of Maryland (6 March), the University of Texas at Dallas (15 March), and Arizona State University (22 March).  The talk title in all three cases was “Analysis of nonlinear dynamics with three time scales“. The picture left shows Bin in Sequoia National Park in California.