Q: Symbiosis (from Greek "together" and "living") is close and often long-term interaction between two different biological species. In 1877 Albert Bernhard Frank used the word symbiosis (which previously had been used to depict people living together in community) to describe the mutualistic relationship in lichens. In 1879, the German mycologist Heinrich Anton de Bary defined it as "the living together of unlike organisms."

The definition of symbiosis has varied among scientists. Some believe symbiosis should only refer to persistent mutualisms, while others believe it should apply to any type of persistent biological interaction (in other words mutualistic, commensalistic, or parasitic). After 130 years of debate, current biology and ecology textbooks now use the latter "de Bary" definition or an even broader definition (where symbiosis means all species interactions), with the restrictive definition no longer used (in other words, symbiosis means mutualism).

Some symbiotic relationships are obligate, meaning that both symbionts entirely depend on each other for survival. For example, many lichens consist of fungal and photosynthetic symbionts that cannot live on their own. Others are facultative (optional): they can, but do not have to live with the other organism.

1. The definition of symbiosis.
2. That it should only refer to persistent mutualisms.
3. They believe it should apply to any persistent biological interaction.
4. Mutualistic, commensalistic, or parasitic.
5. 130 years.
6. De Bary definition.
7. A broader definition.
8. Symbiosis.
9. Greek.
10. To describe the mutualistic relationship in lichens.
11. To depict people living together in community
12. The living together of unlike organisms.
13. Heinrich Anton de Bary.
14. Mycologist
15. German.
16. Some symbiotic relationships.
17. It means both symbionts entirely depend on each other for survival.
18. They are falculative.
19. Optional
20. It's the close and sometimes long-term interaction between two species.
21. Yes.

Numbered questions:
1. What has varied among scientists?
2. What do some believe?
3. What about others?
4. How else could you describe it?
5. How many years was it debated?
6. What is used now?
7. By what?
8. What word is being defined?
9. What language did it originate from?
10. How was it used in 1877?
11. How was it used previously?
12. What about in 1879?
13. By whom?
14. What was his occupation?
15. Nationality?
16. What is obligate?
17. What does that mean?
18. What about others?
19. Meaning?
20. What does symbiosis mean in other words?
21. Are they biological?

Q: (Mental Floss) -- With Mother's Day just around the corner, this week seemed like a great time to give a tip of our caps to stay-at-home moms, including these four who used clever ideas to become business moguls.

Gerber: Of course only a mother could found such a successful baby food company! In the late 1920s, Michigan mom Dorothy S. Gerber was hand-straining food for her baby daughter, Sally, when she realized there must be some way to avoid the messy task.

She pointed out to her husband, Daniel, that if his family's business, the Fremont Canning Company, could puree a tomato all day long, its equipment could probably make short work of other fruits and veggies, too.

Daniel Gerber realized his wife was on to something, and after a year of experimentation -- and an extensive search to find the right drawing for their label's now-iconic "Gerber baby" - the Gerbers introduced their first line of baby foods, a super-yummy menu of strained peas, carrots, prunes, and spinach.

Mental Floss: 6 unforgettable movie mothers

Baby Einstein: When Alpharetta, Georgia mom Julie Aigner-Clark went looking for educational materials for her newborn daughter in 1996, she found a disappointing hole in the baby market: there weren't really any educational materials to expose babies to music and the arts.

Some parents would just accept whatever the market was offering. Not Aigner-Clark. She shot a video for her daughter in her basement then edited it with her husband, Bill, on the family computer. She even doodled a logo for the video at her kitchen table.

1. In the late 1920s
2. Dorothy S. Gerber
3. was hand straining food
4. Daniel
5. businessman
6. Fremont Canning Company
7. a year
8. a Georgia mom
9. Baby Einstein
10. she looking for educational materials

Numbered questions:
1. When was Gerber founded?
2. who was the founder?
3. How did the idea come to her?
4. Who was her husband?
5. What was his line of work?
6. WHat was his business?
7. How long did it take to find the Gerber baby?
8. Who is Julie Aigner clark?
9. What did she create?
10. Why did she?

Q: (CNN) -- Audiences will be getting a new look at Abraham Lincoln this weekend with the wide release of director Steven Spielberg's "Lincoln," and they'll be seeing a lot of America, too.

The film, which recreates the former president's life through the crucible of the Civil War, was filmed at several historic locations. Lincoln's life took him through a number of states before and during the war, which gave Spielberg and his crew a wide geographic canvas.

It was while shooting "War of the Worlds" in Rockbridge County, Virginia, that Spielberg began discussing returning to the state, said Andy Edmunds, interim director of the Virginia Film Office. Edmunds worked with production designer Rick Carter for nine years, helping him scout locations across the state.

Yet there is so much more to Lincoln than the movie that bears his name.

For history and film buffs looking to explore Lincoln's life, here are five locales that go beyond a trek to the National Mall.

DON'T watch these 11 movies on a plane

City Point: Hopewell, Virginia

One of Spielberg's Virginia stops was City Point, now Hopewell, which served as Ulysses S. Grant's headquarters during the Siege of Petersburg.

Lincoln spent two weeks there in 1865 with his family, traveling aboard the war ship River Queen, which filmmakers replicated in full, said Rita McClenny, chief executive officer of the Virginia Tourism Board.

From there, Lincoln watched the fall of Petersburg, later visiting the city, which was also shot on location, Edmunds said.

Indeed, many pivotal wartime decisions "were made on Virginia soil," McClenny said.

1. Virginia
2. Rockbridge County
3. Edmunds
4. Andy
5. No
6. Interim
7. Steven Spielberg
8. Abraham
9. Civil War
10. Yes
11. Carter
12. City Point
13. Yes
14. Hopewell
15. Wide
16. CNN
17. Years
18. Nine
19. Two weeks
20. 1865

Numbered questions:
1. Where was "War of the Worlds" shot?
2. In what city?
3. What is the last name of the director at the film office?
4. And his first name?
5. Is he the permanent director?
6. What term described his position specifically?
7. Who was at the helm of "Lincoln"?
8. What is the first name of the man that the film is about?
9. What war was occurring at the time of the film's setting?
10. Were famously known locals used in the filming?
11. What is the surname of the production designer?
12. What city was Grant's base at one point?
13. Is that city called something different now?
14. What?
15. What sort of release was the film given?
16. From what news outlet is this press release?
17. For how long did Edmunds collaborate with Carter?
18. How many?
19. How long did Lincoln stay in City Point?
20. In what year?