Every teacher knows the particular dread of waking up sick and realizing that staying home means doing more work, not less. Writing sub plans at 5 a.m. with a fever is its own special punishment — which is exactly why so many teachers drag themselves in instead.
The fix is to build a small bank of emergency plans once, while you're healthy, so that on a bad morning you can type one sentence — "Use Emergency Plan 3" — and go back to bed. Below are six science activities that need no prep from you, no materials a guest teacher can't find, and nothing that lands in your grading pile when you get back.
What makes a good emergency science sub plan?
A good emergency sub plan is fully self-contained, needs zero prep from you, and produces nothing you have to grade. A guest teacher with no science background should be able to run it from the instructions alone, it should keep students busy for a full period, and it should reinforce thinking students already have — never introduce brand-new content the sub has to teach.
Hold every emergency plan to five tests:
- Self-contained: all instructions are on the page; the sub teaches nothing new.
- No prep: no copies to run, no labs to set up, no logins to create.
- No grading: students get completion credit, or the work is self-checking.
- Full period: there is enough to do that nobody finishes in ten minutes.
- On-topic but low-stakes: it reviews or applies, so a rough day does no damage.
Keep two versions of your favorites — one that uses devices and one that does not — because you will not know in advance whether the Chromebook cart is charged or even available.
1. Read a science article and respond (CER)
Hand students a short, engaging science article and three claim-evidence-reasoning prompts: What is the author claiming? What evidence supports it? Why does that evidence matter? It needs no setup, works on paper or screen, and reviews the reasoning skills students use all year — so completion credit is all you owe it.
Keep a folder of two or three printed articles at a reading level your students can handle. The sub distributes one, students read and answer the three CER prompts in complete sentences, and the period is full. Because the goal is practicing argumentation rather than a single right answer, you can grade it for completion in seconds when you return.
2. Watch a science video and take 3-2-1 notes
Students watch a vetted science video and capture 3 things they learned, 2 things they found surprising, and 1 question they still have. It runs with a projector and the class WiFi, requires no science expertise from the sub, and the 3-2-1 structure makes every student produce something without any answer key to grade.
Pre-pick one or two videos tied to your current unit and paste the links into the plan so the sub is not searching live. The 3-2-1 format keeps students accountable during the video and gives you a quick read on what landed when you get back — again, completion credit only.
3. Run a no-tech design challenge
Give students a real-world problem and ask them to design a solution on paper: sketch it, label it, and explain how it works and why. A "design a flood-proof house" or "design a tool to pick up trash without bending over" prompt needs no devices, no materials, and no special knowledge from the sub — just paper and pencils.
Design challenges are the most reliable no-tech fallback because they cannot break. Students draw and justify their design, which pulls in the engineering practices NGSS asks for. Add a constraint or two ("under $50," "uses only recycled materials") to push their thinking and fill the period.
4. Assign a digital escape room
A self-grading digital escape room is the closest thing to a sub plan that runs itself. Students work through locked puzzles that only open with the correct science answer, so the activity checks their work automatically. Share the link, and a guest teacher just keeps the room quiet while students solve.
Because the puzzles are self-checking, there is genuinely nothing for you to grade — the lock either opens or it does not. A review-topic escape room doubles as the perfect emergency plan: it is engaging enough that students stay on task for a substitute, and on-topic enough that the day is not wasted. Keep one queued for exactly these mornings.
5. Build a vocabulary concept map or sketch
Students take the key terms from your current unit and organize them into a concept map or a set of labeled sketches, showing how the ideas connect rather than just defining them. It needs only the word list and blank paper, suits any topic, and reviews material students have already seen — so it is safe for a low-supervision day.
Provide the term list in the plan (ten to fifteen words is plenty). Ask students to draw lines between related terms and label each line with the relationship — "produces," "is part of," "is the opposite of." Sketching and connecting forces deeper processing than copying definitions, and you can scan the results for misconceptions in a single pass.
6. Send students on a science scavenger hunt
A science scavenger hunt sends students looking for examples of a concept — find three examples of a chemical change, or five simple machines in this classroom. It works with or without devices, requires nothing from the sub but the instruction sheet, and connects abstract vocabulary to the world students can actually see.
Write the hunt around whatever you are studying: forms of energy around the building, examples of physical versus chemical change at home, news headlines that involve a science idea. Students record what they found and explain why each example fits. It is high-engagement, naturally differentiated, and impossible to "finish early" if you ask for explanations.
How do you make sure there is nothing to grade?
Decide in advance that emergency-day work earns completion credit, not a score, and tell the sub to stamp or initial finished work rather than collect it for grading. Pair that with self-checking activities like escape rooms, and the work either grades itself or takes you one quick pass to credit when you return.
The grading pile is what turns a sick day into a punishment. Build your bank around activities that are self-checking or completion-based, write "completion credit only" right into the plan, and you remove the single biggest reason teachers avoid taking the day they need.
Spend twenty minutes once — print two articles, queue a video, save a design prompt, and stash a review escape room — and you will never write emergency plans at 5 a.m. again. Your future sick self will thank you.