<p>You've heard wrong. It doesn't include less physics than any other engineering. It's not an easier than electrical or mechanical. In some situations it's harder because you take the same classes as electrical and mechanical engineers but then you take other classes that use what you learned in your engineering classes and apply them to the human body, which is rarely as nice, linear, or predictable as some traditional engineering fields. Of course some schools treat bioengineering as a glorified biology major so in that case it might be easier. I doubt that at upenn it's an easier than mech-e or ee.</p>