Scientific Models, part 5

August 31, 2015(1.2 in your books)

Meme Moment

Homework• What does it mean to be a steward of the earth?

• Pick a scientist or invention that can help you be a good steward of the earth and explain why that helps.

6th grade: 1-2 sentences each7th grade: 2-4 sentences each8th grade: 1 paragraph each

Be ready to share with the class tomorrow!

Scientist of the Day

Otto Hahn• Nobel Prize winner• Partner was Lise Meitner• Helped discover nuclear

fission• Direct competitor of Irene

Joliot-Curie (another Scientist of the Day)

• Has an element named after him

• Quit his job instead of collaborating with Nazis

• Helped Lise Meitner escape by giving her family jewels

Controlled ExperimentControlled experiment: Only one variable is tested at a time.

• Scientists like controlled experiments because it’s easier to see what effect each variable has.

• You can find controlled experiments within larger data sets by looking for similar conditions.

• This is different than picking and choosing data (bad science) because you take all the experiments that fit

Group Work1. A. Was the soda & Mentos experiment a

controlled experiment?B. Why or why not?

2. A. How could you find data for a controlled experiment from the observations we collected?

B. What methods or tools could you use?3. If you got to do it again, what would you change

about the experiment?

Questions• Any questions about the slides?

• Any new questions?

Questions from Last Week

• How long do ant eggs take to hatch?I’m not sure, but it takes 6-12 weeks to go from egg to adult ant, and there’s a stage in between where they look like grains of rice with a dot at the end.

eggs pupae

Questions from Last Week

• What is the most venomous snake?Black mambas and coastal taipans are the most dangerous for being a mix of really venomous and living close to humans.

Black mamba Coastal taipan

Questions from Last Week

• How old is Stephen Hawking?He is 73, and his birthday is January 8, 1942.

• What causes ALS?Inherited 5-10% of the time, the rest of the time it just happens. Researchers think it might be gene mutations, an autoimmune disorder, or a chemical imbalance.