National Science Bowl
The National Science Bowl is a high school and middle school science knowledge competition, using a quiz bowl format, held in the United States. A buzzer system similar to those seen on popular television game shows is used to signal an answer. The competition has been organized and sponsored by the United States Department of Energy since its inception in 1991.
Subject areas
Questions are asked in the categories of Biology, Chemistry, Earth and Space Science, Energy, Mathematics, and Physics.Several categories have been added, dropped, or merged throughout the years. Computer Science was dropped from the list in late 2002. Current Events was in the 2005 competition, but did not make a return. General Science was dropped and Astronomy was merged with Earth Science to create Earth and Space Science in 2011.
Regional competitions
The winning team of each regional Science Bowl competition is invited to participate in the National Science Bowl finals in Washington, D.C., with all expenses paid. As of 2018, there were 65 high school regionals and 48 middle school regionals. These figures include the two "super regional" sites that are permitted to send two teams to the national competition. The two super regionals are the Kansas/Missouri Regional High School Science Bowl and the Connecticut/Northeast Regional High School Science Bowl.Typically, any school that meets the eligibility requirements of the National Science Bowl is permitted to register for its regional competition according to its geographic location. No school may compete in multiple regionals. In addition, most regional competitions permit schools to register up to three teams. Since 2017, club teams are no longer able to compete.
Rules
This section begins with the rules for in person competitions and finishes with the rules for virtual competitions.General rules
A team consists of 4 or 5 students from a single school. Only 4 students play at any one time, while the 5th is designated as the alternate. Substitutions and switching captains may occur at halftime, between rounds, or before a tiebreaker round.Two teams compete against each other in each match. Each student is given a designation: A1, A Captain, A2, A3, B1, B Captain, B2, or B3, according to the position they sit in. In regional competitions, each round consists of 23 questions. At the National Finals, each round consists of 25 questions. The match is over when all the toss-up questions have been read, or after two halves have elapsed, whichever occurs first. The team with the most points at this time is the winner. At the regional level, all matches consist of two 8-minute halves, separated by a 2-minute break. At the national level for middle schools, all matches consist of two 10-minute halves. For high schools, all round robin and some double elimination matches consist of two 10-minute halves, with the final rounds consisting of two 12-minute halves to accommodate the longer visual bonus questions. A toss-up/bonus cycle that is begun before time expires in a half will be finished under the usual rules before the half ends. A question officially begins once its subject area is completely read.
Toss-ups
Every match begins with a toss-up question. The moderator announces the subject of the question, as well as its type. Once the moderator completes the reading of the question, students have 5 seconds to buzz in and give an answer. Students may buzz in at any time after the category has been read—there is no need to wait for the moderator to finish. However, there is a penalty for interrupting the moderator and giving an incorrect answer. After buzzing in, a student must wait for an official to verbally recognize them by saying their designation; otherwise it is considered a blurt, resulting in the answer being ignored and the team being disqualified from answering the toss-up. Upon recognition, the student must give their response within a natural pause ; otherwise it is considered a stall and ruled incorrect. If a student buzzes in and answers incorrectly, that student's team may not buzz in again on that question, and the opposing team gets another 5 seconds to buzz in. Quiet nonverbal communication among team members is allowed on toss-ups, but audible communication or mouthing words is not permitted and will disqualify the team from answering the toss-up.An answer given by a student is ruled correct or incorrect by the moderator. On short answer questions, if the answer given differs from the official one, the moderator uses his or her judgment to make a ruling. On multiple choice questions, students may give the letter answer or the verbal answer. A verbal answer on a multiple choice question is only correct if it matches the official answer exactly. However, when the choices are mathematical expressions that would be conventionally written in symbols, common alternate expressions of the answer shall be accepted. For example, “square root of 2” and “square root 2” would both be accepted.
Bonuses
If a student answers a toss-up question correctly, that student's team receives a bonus question. The bonus question is always in the same category as the corresponding toss-up question, though it may not always relate to the toss-up question. Since only one team has the opportunity to answer the bonus question, there is no need to buzz in to answer it. After the moderator finishes reading the question, the team has 20 seconds to answer. The timekeeper will give a 5-second warning when 5 seconds remain. Conferring between team members is permitted, but the team captain must give the team's final answer.Visual bonuses were introduced in 2003. They are only included in the final elimination rounds. The team has 30 seconds to answer a question with the aid of a visual displayed on a monitor or on a distributed worksheet.
The same rules apply to the judging of responses to bonus questions as apply to responses to toss-up questions. Once the team's answer has been ruled right or wrong, the moderator proceeds to the next toss-up question.
If neither team answers the toss-up question correctly, the bonus question is not read, and the moderator proceeds to the next toss-up question.
Scoring
Correct responses to toss-up questions are worth 4 points each, and correct responses to bonus questions are worth 10 points each.If a student buzzes in on a toss-up question before the moderator has completely read the question and answers incorrectly, then 4 points are awarded to the opposing team, and the question is re-read in its entirety so that the opposing team has an opportunity to buzz in. Should the opposing team interrupt during the rereading of the question and subsequently incur a penalty as in the previous rule, then 4 points are added to the first team's score, and the moderator proceeds to the next toss-up question.
Challenges
Challenges must be made before the moderator begins reading the next question, or 3 seconds after the last question of the half or game. Only the 4 actively competing members may challenge. The fifth team member, coach, and others associated with a team may not become involved in challenges or their discussion. However, beginning in 2020, anyone in the competition room can make the officials aware of scoring or clock management errors, these are known as corrections rather than challenges.Challenges may be made either to scientific content or the administration of rules. They may not be made to judgment calls by the officials, such as whether a buzz was an interrupt, whether 20 seconds have passed before beginning to answer a bonus, or whether a stall or blurt has happened. Challenges to scientific content are limited to 2 unsuccessful challenges per round. Successful challenges do not count against this limit. Each team has unlimited challenges to administration of rules.
Rules for Virtual Competitions
For 2026, the US Department of Energy will host a nationwide virtual regional Science Bowl for schools meeting certain criteria. Additionally, in-person regional events may be required to switch to a virtual event at any time.Beginning in 2026, virtual events will use a head-to-head format. The rules are very similar to in-person events, with the following differences:
- The rounds have 18 questions with two halves of 8 minutes.
- Each player and coach must be in different rooms.
- In order to answer a bonus question, the team captain must raise their hand and say their answer.
- On toss-up questions, team members may only communicate nonverbally using hand signals. No writing, use of the Zoom chat box, audible communication, or mouthing words is permitted.
Competition format
Regionals typically use round robin, single-elimination, double-elimination, or any combination of these formats. The 2026 virtual regional event managed by the US Department of energy will use a combination of round-robin and single-elimination.
The national competition always consists of two stages: round-robin and double-elimination.
Round-robin
All competing teams are randomly arranged into eight round-robin groups of eight or nine teams each for high school and six teams each for middle school. Every team plays every other team in its group once, receiving 2 points for a win, 1 point for a tie, or 0 points for a loss. If a team's opponent has not arrived, that team can practice instead. The rules still apply, though any win or loss is not counted. In previous years, the top two teams from each group advanced to the double-elimination stage. Starting in 2020, four teams from each group will advance.Tiebreaks
In the event that two or more teams are tied for one of the top spots in a division, the result of the Division Team Challenge is used as a tiebreak. This method is only used for high schools.For middle schools, there are several tiebreak procedures, applied in the following order:
- The head-to-head record of all the tied teams is compared. If this separates a group of two or more teams from the rest of the tied teams, the head-to-head record will be reapplied in the smaller group.
- If the top four teams cannot be determined using head-to head records, the following procedures are used:
- * If more than two teams are still tied, each team is placed in a separate room and is read five toss-up questions. Each team's score is determined by the number of questions answered correctly minus the number answered incorrectly. The team with the highest score win the tiebreak.
- * If two teams are still tied, the two teams compete head-to-head, receiving five toss-up questions at 4 points for each correct answer. All the usual toss-up rules are in effect, including the interrupt penalty. The team with the higher score wins the tiebreak.