Future Perfect is possible with an MIT tool, such as a future perfectly.
What is by which (e.g. by)? Who wrote the first sentence? I am a professional. By August I will have finished my thesis. In August, Gordon will have been at this company 25 years. The time is not in the future. Is it correct to say August? Should it not be by August?
What’s the point of giving some examples of successful entrepreneurship?
Both are correct, because neither is necessary.
How long would it take (or are they) to be alive 100 years from now? When does future perfect happen? To help your audience understand when, you need a subordinate clause indicating when, during, or something semantically equivalent to those two. How do we get additions like By August and In August?
When will these experiments happen by giving us the time frame of August 1 – August 31, and where will this occur? By helps establish when this will happen by restricting the time frame implied by future perfect tense (that time frame being after now) to after now but before this other event. What “Day” means between day 1, day 31 and August 1, 2018. So by mean between today and August 1. So basically there were between day 1 and day 31. So we essentially have by meaning between today and August 1, 2018. So we have in meaning between day 1 and day 31 and by means between today and the month of August.
You can use either, it just depends on what you want to communicate – by gives us up to this point, whereas in gives us between these two points.