It can be tricky to meet people as a solo traveler when you're not staying in a social environment like a youth hostel. (pinterest.com)
Some people learn better when they study alone while some learn better in a social environment. (elearningindustry.com)
Perhaps because our automatic responses have evolved in social environments where self - interested behavior in the short - term has not always lead to personal gains over the long - term. (scientificamerican.com)