What are some examples of lighter-than-air vehicles?

These tools give presenters more freedom to move about the room and interact with their audience. laptop computer laser pointer lcd projector remote control

Shown below is the start of a coding region within the fist exon of a gene. 5'--3' 3'--5' how many cas9 pam sequences are present?

What characteristic of long period comets suggest they come directly from the oort cloud?