Informality is normal. Direct and straightforward communication is expected. Friendship is usually based on doing things in common - sports, studying, etc. Combining theory and practice - the practical application of ideas is emphasized. The scientific method and the use of logical proof are emphasized academically.
Friends are often limited to an area of common interest, such as work, school, or recreation.
Friends get together to enjoy an activity together. Friends are changed if they do not live up to our expectations or standards of behavior. Friendships cross genders. Friendships cross generations. One schedules time to see friends.