Mr Mahdavi says his technique could control the size and positioning of the bubbles in such foam, and so determine the material's strength and rigidity.
"The described technique cannot engage or control the aircraft's autopilot system using the (Flight Management System) or prevent a pilot from overriding the autopilot, " the FAA said.
Using an external keyboard is another technique to help you control the level at which you want to operate from if you have an adjustable chair or desk.
For example, if a yeast cell was genetically modified to include a particular gene, this technique would allow the expression of that gene to come under precise control.