45KiB, 600x764, e0ll3.jpg View SameGoogleiqdbSauceNAO Anonymous Sun 09 Feb 13:59:07 2020 No.11371687 ViewReplyOriginalReport Quoted By: >>11371700 >>11371827 >>11371852 >>11371942 >>11373338 >>11373344 What's the most difficult sub field of engineering. Fluids, thermo, or materials?