Abstract: An aerial vehicle barrier comprises two or more balloons selectively inflatable with a lighter-than-air gas, two or more flexible trunk lines, two or more flexible branch lines, and two or more connecting lines. Each trunk line has a ground-anchorable end and an opposite end attached or selectively attachable to a respective one of the balloons. Each branch line has opposing ends attached or selectively attachable to respective ones of two adjacent trunk lines to span between the two adjacent trunk lines. Each connecting line has opposing ends attached to respective ones of two adjacent branch lines.

Abstract: A writing instrument comprises nonretractable nib 14 made of porous material and being in fluid communication with an ink reservoir of fluorescent transparent ink, the nib colloquially known as a "highlighter". A second nib 16 is retractable and is substantially rigid and is in fluid communication with a second ink reservoir of nontransparent ink, the second nib colloquially known as a "ball point pen". The retractable and nonretractable nibs extend from an angular face of an elongated body in which they are contained. The angular face permits the nonretractable and retractable nibs, which are in parallel relation, to extend in spaced relations so that the retractable nibs extends beyond the nonretractable nib whereby the nonretractable nib does not contact the writing surface when the retractable nib is used as writing instrument.