The legislation’s advocates say a close call between two private planes near Teterboro, N.J., on Feb. 13 underscores the need for more collision prevention technology.

Accurately modeling irregularly-shaped particles isn’t easy, but a new study found a way to improve a century-old idea.

That doesn’t make the effort futile. It places it in context. Bio-based foams represent one strategy among many: redesign packaging, reduce unnecessary cushioning, regulate the worst offenders, and ...