Top 100 presentations

1. Continuous Verb Tenses
   35299
2. Support and transport in plants
   33780
3. Anyong Tubig Anyong Lupa sa Asya
   29284
4. Elements compounds and mixtures
   25978
5. Chromosome
   21956
6. Simple Verb Tenses
   20783
7. Atomic Structure
   20185
8. Balancing Chemical Equations. Balancing redox equations
   20106
9. Periodic Behavior
   19873
10. Newton’s laws of motion
    18834
11. Periodic Trends
    16736
12. Adverbs
    16633
13. Percent Composition, Empirical and Molecular Formulas
    15967
14. Animal Farm
    15768
15. Bonding, Molecular Shape & Structure
    14716
16. Circulation and Gas Exchange
    13396
17. MakingFood
    13381
18. DNA - An overview
    13029
19. Fungi
    12861
20. Atomic Structure and Periodic Trends
    12814
21. Volumetric
    12648
22. Feminism- Cure or Curse
    12535
23. Atomic Structure and Periodicity
    12477
24. Hormones and the Endocrine System
    12112
25. Animal Development
    12019
26. Derivation Applications of Bernoulli Principal
    11884
27. Osmoregulation and Excretion
    11443
28. Plasma Membrane-Gateway to the Cell
    10770
29. Plant Structure, Growth, and Development
    10691
30. Acid, bases and salts
    10221
31. Development
    10190
32. Mirrors and Lenses
    10112
33. Structure of the Atom
    9920
34. Balanced forces
    9886
35. Ancient Civilizations
    9807
36. Mass Spectrometry
    9746
37. Pronouns
    9723
38. Nouns
    9667
39. Resource Acquisition and Transport in Vascular Plants
    9466
40. Forests
    9370
41. Support and transport in plants
    9329
42. Atomic Structure
    9288
43. Cell Types and Cell Structure
    8982
44. Newton’s third law of motion
    8913
45. Animal Nutrition
    8673
46. Transplantation Immunology
    8613
47. Cellular respiration
    8493
48. Growing Plants
    8340
49. Sensory and Motor Mechanisms
    8303
50. Electrical Circuits
    8236
51. Plant Responses to Internal and External Signals
    8130
52. Lab Equipment
    8026
53. Prepositions
    7972
54. Viruses, Viroids, and Prions
    7873
55. Neurons, Synapses, and Signaling
    7846
56. Of Mice and Men
    7797
57. A Tour of the Cell
    7671
58. Basic Structure of a Cell
    7644
59. Real time PCR and it's functions in diagnosis
    7592
60. Covalent Bonding (Molecules)
    7574
61. Plant structure adaptations and responses
    7533
62. Ionic Bonding
    7438
63. Cellular Division
    7416
64. Mendelian Genetics
    7076
65. To Kill a Mockingbird
    7042
66. Blood Type Genetics
    7007
67. Satellite Orbits and Uses NIS
    6999
68. Molecules and Ions
    6907
69. Well logging The Bore Hole
    6887
70. Sound
    6854
71. The Immune System
    6803
72. Membrane Structure and Function
    6732
73. Animal Reproduction
    6697
74. The Chemistry of Acids and Bases
    6648
75. Angiosperm Reproduction and Biotechnology
    6630
76. Rocks
    6598
77. Mendel and the Gene Idea
    6564
78. Plant Diversity
    6562
79. Cell Communication
    6500
80. Balancing Chemical Equations
    6475
81. Rate Laws
    6352
82. Drama
    6314
83. Hybridization of Orbitals
    6298
84. Introduction to Oscillations and Simple Harmonic Motion
    6293
85. The Building Blocks of Matter Atoms
    6220
86. Empirical Formula
    6205
87. Electron Quantum Numbers
    6153
88. An Introduction to Metabolism
    6108
89. Translation. Protein from RNA
    6080
90. Neurons
    6024
91. The Structure and Function of Large Biological Molecules
    5941
92. The Mole
    5898
93. Photosynthesis
    5873
94. Cell Membrane + Tissues & Organs Definitions
    5865
95. Earthquakes
    5826
96. Karyotypes
    5823
97. ADP, ATP and Cellular Respiration
    5792
98. Endocrine System
    5749
99. Classical greek philosophy
    5671
100. Population Ecology
     5634

Research and Development, Experimental aerospace engineering center in Serbia (Space Technologies)