Answer:
innovative vaccine technologies,I guess~
<span>Fixed Price Contracts, Cost Reimbursable Contracts, and <span>Time and Material Contracts are the three basic types. Not to mention </span></span>Sale contracts, Employment contracts, business contracts, and leases.
Answer:
Come up with a controversial topic, one that make your listeners think
Research the topic thoroughly that you have chosen
Understand the perspective of your audience. Keep your goal in mind. You are trying to persuade the audience to do or believe something .
This totally depends on what they need and what they are willing to spend. If they just need access to google docs/ sheets etc for example (so just the web with a web browser), either Linux / Un*x or Windows will do and linux is the free choice. If they want to be part of the microsoft ecosystem or use some windows specific software they will need to use Windows or an emulator in Linux.
I would not recommend MSDOS in this day and age.