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Re:“This story is being previewed exclusively on Apple News ... by andreyf on Monday September 21, 2015 @12:03AM (#10250309)
For emphasis there is italics, which you can make by adding asterisks around the word.
Re:“This story is being previewed exclusively on Apple News ... by kuschku on Monday September 21, 2015 @11:06AM (#10252773)
And if I want 𝗯𝗼𝗹𝗱 text? I know how to get italics.

Most typographs disagree with using italics:

> If you’re us­ing a sans serif font, skip italic and use bold for em­pha­sis. It’s not usu­ally worth ital­i­ciz­ing sans serif fonts—un­like serif fonts, which look quite dif­fer­ent when ital­i­cized, most sans serif italic fonts just have a gen­tle slant that doesn’t stand out on the page.

http://practicaltypography.com/bold-or-italic.html

Re:“This story is being previewed exclusively on Apple News ... by p00b on Monday September 21, 2015 @12:36AM (#10250397)
Which was explained in the cited link.
Re:“This story is being previewed exclusively on Apple News ... by kuschku on Monday September 21, 2015 @11:12AM (#10252817)
Which does not help me when most typographers say to use 𝗯𝗼𝗹𝗱 for emphasis: http://practicaltypography.com/bold-or-italic.html