I read in Lassiter's Tax Guide that travel expenses could be deducted from 2016 Form 1040 or Form 1040A if they were for business purposes.
I spent money on airplane flights from North Carolina to Boston Logan to gather material for a book or I.E.E.E article about a new U.S. patent to deconvolve signals through polynomial division with a 48-way multicore parallel processor. Can I deduct these expenses?
Hobby expenses are not tax deductible. Business expenses are, but only if it's a bona fide business.
First they look at profitability: if you reported a net profit (i.e. paid taxes) in your first 3 years, they will believe you rant on Youtube for a living. Remember, by the time they get around to auditing you, you'll likely be well into, or through, your third year.
There is an exception for farms. Other than that, if you lose money year after year, you better be able to show that you look, walk and quack like a business; and one with a reasonable business reason for delayed profitability. For instance Netflix's old business model of mailing DVDs had very high fixed infrastructure expense that took years to turn profitable, but was a very sensible model. They're fine with that. Pets.com swandived into oblivion but they earnestly tried. They're fine with that too.
You can't mix all your activities. If you're an electrician specializing in IoT and smart homes, can you deduct a trip to the CES trade show, you bet. Blackhat conference, arguable. SES? No way. Now if you had a second business of a product-reco site which profited by ads and affiliate links, then SES would be fine to deduct from that business. But if this second business loses money every year, it's a hobby and not deductible at all.
That person would want separate accounting books for the electrician and webmaster businesses. That's a basic "duck test" of a business vs. a hobby. You need to be able to show how each business gets income and pays expense separate from every other business and your personal life. It's a best-practice to give each business a separate checking account and checkbook.
You don't need to risk tax penalties on a business-larva that may never pupate. You can amend your taxes up to 3 years after the proper filing date. I save my expense reciepts for each tax year, and if a business becomes justifiable, I go back and amend past years' tax forms, taking those deductions. IRS gives me a refund check, with interest!
